D&D 5E Help with 19th level boss fight

Hey all,

When the next session of my campaign takes place, we'll be rolling initiative for the most monstrously complex (and unfair) fight that I've put my players up against yet. I'm coming to you for help in ensuring that I made interesting and fun choices for the bad guys. Let me begin by outlining the situation.

Outline
The players are in Tu'Narath, home to the Githyanki, and have fought their way into the throne room of the Lich Queen Vlaakith CIX. This is from the 3rd edition adventure Lich Queen's Beloved. She's perfectly aware of who they are, and has been scrying on them enough to have a good understanding of their abilities and tactics. The characters were greeted by Vlaakith, who offered them the chance to achieve all their goals (free some slaves) and leave without repercussions, but they decided to go for combat instead. They didn't want to leave her - a powerful lich - alive, and also didn't want to 'get a reputation as quitters'. They made that choice in the full knowledge that this fight is likely to be a TPK, so I deem that I can take the gloves off and go for the kill, within reason.

The opposition here is really, truly, punishing: in addition to a CR25 Lich (all wizard spells known, 473hp), there is two 16th level undead spellcasters (same spell list as a Lich), two CR10 spectral Githyanki Knights, and two Adult Red Dragons without wings. The EXP here is 162,800, with a difficulty after modifiers of 407,000. In other words, 8x Deadly for a party of this size and level. Hopefully a file will be inserted below here which shows the layout of the room - enemy along the left wall, a dragon to the top and bottom, party on the right, and a necrotic-damage spell trap in the centre of the room. Miscellaneous magical effects in the location include no invisibility, everyone can fly at the speed of their Intx3, everything has resistance to radiant damage.

2017-06-14 22.11.08.jpg


The Party's Plan
They are 19th level: Storm Cleric, 4Elements Monk, Devotion Paladin, Champion Fighter Archer, Arcane Trickster. No sharpshooter on the Champion. Their plan is to use a 8th level Cleric slot and the monk's Ring of Wishes to cast two Antimagic Fields, and use them to neuter the Lich and at least one of her spellcasters. They'll move into melee and grapple to try and make it stick. The Paladin will dual-cast Banishment on the Dragons to try and get rid of them. Then everyone will try and nuke down the Lich first.

Antimagic field is a complex spell: here is a blog post discussing it and giving the spell's text. The party expects that they'll lose the ability to kill the Lich in melee (no magic weapons, she's immune to non-magic weapons) except for the Monk and his magic fists.

Enemy Plan
My baseline plan was for Vlaakith to use True Polymorph on herself (not Meteor Swarm, which the party are expecting) and to try to use an Ancient Silver Dragon's breath weapon to paralyze the whole party, especially those that normally avoid Red Dragon breath weapons with evasion. If that failed, she'd at least have loads of free HP. Once knocked out of that shape, probably Forcecage would be my next step, but I'm wary of it since the party cannot do anything about it - no arcane caster so no friendly short range teleport options, and it isn't even concentration. It seems likely to be unfun, so I didn't want to open with it. The two spellcasters would just use Finger of Death and whatnot to try and chip away at the party, and the Dragons would wade into melee.

As to the party's plan, it seems to me to be very devious. The Dragons are unlikely to fail against Banishment - since they have +11 on Cha, even if I ignore their Legendary Resistance as they're really not the boss here - but the Antimagic fields are the killer. Once those are cast, I can see only two routes for Vlaakith and her minions: either fight in melee to try and break concentration, or use Counterspell at the moment of casting to shut it down. Having her do Counterspell would almost certainly work - the party can't cast that themselves - but seems like a bit of a dick move to arbitrarily negate what is actually an interesting tactic.

My Question to you
What should I have the bad guys do? I wouldn't normally come to a forum for answers on how to handle a party's tactics, but like I say, it's a big one. In addition, this is probably going to be the biggest fight in the campaign as a whole, which has run from 1-20, so I want it to stick in the mind whether it's won or lost.

Part of my mind is to let the party try the anti-magic, and not counterspell it or whatnot; the fight is insanely tough anyway, so letting good play negate the Lich isn't a bad thing, and the monk alone will struggle to strip 473hp from her in melee. However, it's worth asking ya'll what you think about it, and seeing whether I've missed any more interesting options.
 

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CapnZapp

Legend
Hey all,

When the next session of my campaign takes place, we'll be rolling initiative for the most monstrously complex (and unfair) fight that I've put my players up against yet. I'm coming to you for help in ensuring that I made interesting and fun choices for the bad guys. Let me begin by outlining the situation.

Outline
The players are in Tu'Narath, home to the Githyanki, and have fought their way into the throne room of the Lich Queen Vlaakith CIX. This is from the 3rd edition adventure Lich Queen's Beloved. She's perfectly aware of who they are, and has been scrying on them enough to have a good understanding of their abilities and tactics. The characters were greeted by Vlaakith, who offered them the chance to achieve all their goals (free some slaves) and leave without repercussions, but they decided to go for combat instead. They didn't want to leave her - a powerful lich - alive, and also didn't want to 'get a reputation as quitters'. They made that choice in the full knowledge that this fight is likely to be a TPK, so I deem that I can take the gloves off and go for the kill, within reason.

The opposition here is really, truly, punishing: in addition to a CR25 Lich (all wizard spells known, 473hp), there is two 16th level undead spellcasters (same spell list as a Lich), two CR10 spectral Githyanki Knights, and two Adult Red Dragons without wings. The EXP here is 162,800, with a difficulty after modifiers of 407,000. In other words, 8x Deadly for a party of this size and level.
I like it. They're five heroes and they will presumably start fully rested, so...

This should actually be challenging 😉

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Zardnaar

Legend
Heading into TPK territory with that amount of spellcasters+ 2 Dragons. X5 over deadly is as far I have gone.

Still they are level 19 I suppose.
 

I like it. They're five heroes and they will presumably start fully rested, so...

This should actually be challenging

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Yeah, they had a couple fights before, but they were not unduly challenged by them - despite one fight having four Githyanki Knights, a Beholder, and a Diviner! Right before this room they got a short rest, so they're looking fairly fresh.
 

S'mon

Legend
Having her do Counterspell would almost certainly work - the party can't cast that themselves...

LOL. Your party are taking on Vlaakith, Immortal Lich-Queen of the Githyanki, one of the most powerful wizards in the Multiverse, and they can't cast Counterspell? :D

I think in your shoes I'd just say "You know this is going to be a TPK, right?" and then make the beatdown as fun as possible. But I guess you're running it more 4e style, which is fine too.

Edit: CR 25 & 473 hp looks right for Vlaakith. I've been statting Wiz-20 Legendary Runelord Karzoug
in 5e for my Rise of the Runelords game, he looks like a CR 24 with 573 hp but he's more a fightery
type than Vlaakith probably. AC 24, Spell Save DC 22/Spell Attack +14. As listed he has an adult blue dragon,
a CR 18 Rune Giant, and 2 CR 14 advanced storm giants with him. Intended to be a tough to very
tough fight for 5 competent level 20 PCs with several Epic Boons.
 
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Geeknamese

Explorer
It's a tough fight. But a 1-20 campaign ending with a TPK is seems rather a shame. I know that the Lich has been scrying them and watching their tactics but I would, myself, run it with as little metagaming on the DM's part as possible. For instance, he Rogue seemingly so lucky as to barely escape breath weapons in the nick of time. Tymora must love him. I play it that way instead of having the lich know the metagame knowledge that the rogue has evasion so he can escape with a saving throw so I will prepare this for him instead.

Secondly, I consider the fun of the game a great story and epic feats and encounters. I don't get any fun out of squashing my PCs and ending a 1-20 campaign that way. So for this Lich, if it's really an obviously TPK encounter, I'd err on being a little lenient upfront and give them a head start. For instance, this is the Inmortal Lich Queen of so and so, the most powerful Mage in the world...well, if that's the case, she might see the PCs as insignificant peons and take them slightly a little too lightly at first then slowly with realization, she starts to amp up the heat.

But hey, can't wait to hear what happens :)


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Sadras

Legend
Sounds like its going to be a glorious TPK :p
It is interesting to me, that a 19th level party does not have one magical weapon amongst them but has a magical ring with two Wishes to spare. The radiant resistance is gonna hurt the Paladin too.

Do the characters have any idea who they are facing (numbers and creature type)?
I mean if they do they must feel pretty confident of their abilities. I mean you play this right, they're dead, no question. Also I don't think you should hold out any punches when you're dealing with essentially the last combat of the campaign. No regrets.
A new campaign can always deal with her, if she survives - but if they kill her and you have regret about softballing the PCs that is way worse in my opinion. You cannot fix that.
 

LOL. Your party are taking on Vlaakith, Immortal Lich-Queen of the Githyanki, one of the most powerful wizards in the Multiverse, and they can't cast Counterspell? :D

I think in your shoes I'd just say "You know this is going to be a TPK, right?" and then make the beatdown as fun as possible. But I guess you're running it more 4e style, which is fine too.

Edit: CR 25 & 473 hp looks right for Vlaakith.

Yeah, I felt that just raising HP would make her more dangerous - it stops her being a glass cannon, and makes her just a cannon!

As for the 4e style - I do tend a lot to Combat as Sport, if you know that term. I mean, not religiously, but in general that's how it goes. So while we can think of ways for Vlaakith to win easily - have her minions cast Forcecage on the Paladin, Counterspell everything, etc - I'd prefer it was a fun fight even if it is a TPK, not a frustrating murderfest.

Sounds like its going to be a glorious TPK :p
It is interesting to me, that a 19th level party does not have one magical weapon amongst them but has a magical ring with two Wishes to spare. The radiant resistance is gonna hurt the Paladin too.

Antimagic field deactivates magical weapons. So if they use it to shut down the Lich's spellcasting, they also lose the ability to hurt her with them. They've accepted that as a tradeoff in their planning.
 

jasper

Rotten DM
Never! Ever! Fight a 19th level boss. You tick him off even if you right. WHAM BLAM. Up to the 20th level boss. Then 20 minutes later it is Chim Chim Cheerie! and out the door on the 1st level with your banker box of your stuff with 2 guards are shaking you down for the office pens.
 

Sadras

Legend
Yeah, I felt that just raising HP would make her more dangerous - it stops her being a glass cannon, and makes her just a cannon!

As for the 4e style - I do tend a lot to Combat as Sport, if you know that term. I mean, not religiously, but in general that's how it goes. So while we can think of ways for Vlaakith to win easily - have her minions cast Forcecage on the Paladin, Counterspell everything, etc - I'd prefer it was a fun fight even if it is a TPK, not a frustrating murderfest.



Antimagic field deactivates magical weapons. So if they use it to shut down the Lich's spellcasting, they also lose the ability to hurt her with them. They've accepted that as a tradeoff in their planning.

Ah, that is my bad, I misunderstood when you mentioned 'no magic weapons'.
Please do tell us how it all plays out.

Funny enough I plan to end our 5e campaign with that particular module. I have introduced the Githyanki presence ever so briefly within our ToD story-arc. The splinter organisation, Sha'sal Khou, seeking to remove Vlaakith is secretly assisting the Cult with their plans, hoping to gain favour with Tiamat and have the dragon-deity turn on the Lich for the abominations, Duthka'gith, she is creating with her bastardising of the pact between gith and the dragons.

This ties in with the module's Zetch'r'r soliciting aid from non-githyanki heroes (to destroy the lich queen), who have effectively opposed his people in the past (the Sha'sal Khou in my ToD storyline).

Still have some ways to go.
 
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