D&D 5E It Came from the Depths of the Abyss

Eltab

Lord of the Hidden Layer
The situation:
A Band of Heroes (a.k.a. the PCs) have defeated Boss1 and Boss2. They are known to be sailing aboard a merchant ship towards Boss3, Boss4, and FinalBoss’s home. The remaining bosses meet to take counsel. All bosses have gained their power by consorting with fiends. They know the PCs have located a legendary weapon (a Sword of Fiend-Slaying) and are heading towards a Sword of State – possibly to spark a revolt in the land the bosses oppressively misrule.

The bosses’ plan is to summon an aquatic abyssal creature to attack and sink the merchant ship. They want to create a death trap for the PCs, similar to the IRL fate of the USS Indianapolis’ crew, but done on purpose.

The remaining Bosses understand the power of information. To make sure they are hitting the right target, several “fishing boats” form a picket line well off-shore, with orders to meet every incoming ship. There are legitimate fishermen aboard, who will attempt to sell fresh fish to the crew of the ship. This is honest cover activity; but meanwhile a Wizard (hiding out of sight aboard the fishing boat) uses a spell such as Arcane Eye to observe aboard the merchant ship. Or the Wizard might have a fiendish familiar that can be sent to spy out the ship. In both cases, the Wizard has been given a description of the PCs, and the PCs are believed to be so overconfident that they will not take precautions or be vigilant against the tracks and traces left by the observation method(s). When the ship with the PCs is located, the beast will be summoned against it as it nears the horizon, as seen from the fishing boat’s deck. (Mid-level Wizards are not expendable cannon-fodder, we don’t want to accidentally destroy one in the process of deliberately destroying the PCs.)

Considerations:
- The merchant ship and the fishing boat will be converted from 3e-era stats for size, crew, HP, &c.
- I do not yet know what level the PCs will be for this scenario; I anticipate L10 plus or minus 2. I need a range of potential encounters, based on what level they actually are (how tough they have become).
- The Wizard might perform the summoning with a Ritual rather than a spell slot. Ditto the scouting method (Arcane Eye requires a Wiz7 for a 4th-level spell slot). He will be equipped with whatever is needed within the rules to perform his task; he has a special job to perform and an organization backing him up, after all. 4e residuum, a 3e circle of casters, whatever can be plausibly explained is fair game.

Possible creatures to summon:
- Plesiosaur (“Nessie” the Loch Ness Monster)
- Megalodon (XL Great White Shark)
- Kraken, not intelligent
- Giant Squid, as in 20,000 Leagues Under the Sea
- Use some big beast to deal with the ship plus a swarm/school of smaller monsters to deal with swimmers and lifeboats

My questions:
- Is there an aquatic layer of the Abyss? This will add to the lore (and the feel, I hope) of the campaign
- What denizens live in that layer?
- What other covert methods of spying out the ship could the hidden magic-user use?
- Is there any monster from the Elemental Plane of Water that would be appropriate?
- Are there other well-known sea beasts to use? From movies, books, TV shows, anything iconic.
- Is there a template to make a 5eMM monster into an Abyssal creature?
- Is there a guide to add / subtract levels or CR from published monsters?

Many thanks to all.
 

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TheNoremac42

Explorer
The Abyss, due to its chaotic nature, is infinite in its layers. I'm sure there is an aquatic layer somewhere in that mess, but to my knowledge there is no official lore for it. So it is free for you to build off of and expand to your imagination's reach.
 

MarkB

Legend
There aren't many swords of fiend-slaying around, so if they use locate object and find one aboard a ship, they can be pretty sure it's the right one. This does require the big bads to have access to a similar sword beforehand, in order to familiarise their mages with it.

Using a submersible vehicle or wizards of an aquatic race will allow them to check incoming ships without ever breaking the surface. This might allow the wizards to not be stationed aboard the ships at all, or even do away with the need for any visible picket line.

You mentioned 20,000 Leagues Under the Sea, so you could consider running with the same twist - the 'sea monster' is actually a heavily-armoured submarine with a fiendish crew, and will attack by ramming the ship to cripple it, after which the fiends swarm the decks.

Disney went with the giant squid in the movie, but as I recall, in the novel the Nautilus actually encounters a giant Nautilus at one point.

the-nautilus-and-the-ammonite-fig-1.jpg


Go with one of those, and you still get the tentacles, but couple them with a hard-to-crack shell that provides extra defense and could be used for ramming attacks.
 

UnknownDyson

Explorer
- Is there an aquatic layer of the Abyss? This will add to the lore (and the feel, I hope) of the campaign

There are many, as the Abyss has infinite layers. The Abyss is unique among planes in that it can actually be considered "alive", it has a will and and can create creatures and layers on its own. Some famous aquatic abyssal layers are the 88th layer of the Abyss the Gaping Maw, ruled by Demogorgon Prince of Demons and the 89th layer Shadowsea, ruled by the Obryrith lord Dagon.

- What denizens live in that layer?

Mostly aquatic demons and other evil aquatic creatures. Gaping Maw - Ixitxachitl, Merrow, Aquatic Mariliths, Krakens, aquatic nagas. Shadowsea- Aquatic Mariliths, Krakens, chuuls, sea hags, aquatic nagas. Honestly because of the corrupting influence of the Abyss, you could put a demonic template on almost any aquatic creature and it be effective. You could have Demgorgon appear as a result of the wizard's ritual. He is statted in Out of the Abyss.

- What other covert methods of spying out the ship could the hidden magic-user use?

The wizard could cast clairvoyance, scrying and locate creature (if he knows his quarry) to get a better idea where his enemies are.


- Is there any monster from the Elemental Plane of Water that would be appropriate?

It seems like you want a kraken here, Demgorgon would also work but that depends on if your wizard is powerful enough to summon a demon of that magnitude. You could just have the party contend with a Gargantuan sized demonic shark.

- Are there other well-known sea beasts to use? From movies, books, TV shows, anything iconic.

Anything lovecraftian. You could just google aberrant sea monster and a ton of stuff you can use will come up. Dagon, would be great for this, although it hasn't been statted, here is a picture.
dagon__demon_prince_of_the_sea_by_michaeljaecks-d5ubvvz.jpg
There is an epic monster thread on this forum that gets updated periodically, you should check it out. http://www.enworld.org/forum/showthread.php?468639-5e-EPIC-MONSTER-UPDATES

- Is there a template to make a 5eMM monster into an Abyssal creature?

Not exactly but its simple to explain. Give the creature resistance to cold, lightning, and fire. Give the creature magic resistance and dark vision. Demons tend to have really high con and strength, you want a sea monster so it seems like that should be true. Higher level demons typically have truesight 120, innate spellcasting and a teleport 120ft action. That might not make sense for a sea monster so think about what abilities you want it to have.

- Is there a guide to add / subtract levels or CR from published monsters?
See the dungeon master's guide on creating a monster.
 
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TheNoremac42

Explorer
There are many, as the Abyss has infinite layers. The Abyss is unique among planes in that it can actually be considered "alive", it has a will and and can create creatures and layers on its own. Some famous aquatic abyssal layers are the 88th layer of the Abyss the Gaping Maw, ruled by Demogorgon Prince of Demons and the 89th layer Shadowsea, ruled by the Obrytith lord Dagon.

Ahh... Forgot ol' Demo and his mirrored layer. Never heard of the other one though.
 

Ancalagon

Dusty Dragon
The foes of the PCs seem resourceful and intelligent. A giant monster may not be the most optimal solution. Furthermore, the true weakpoint here is the ship itself. Sinking said ship may be easier to accomplish

Sent from my SM-G930W8 using EN World mobile app
 

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