The party enter a large cavern illuminated by an eerie phosphoresent fungus. A large crevasse 60' across, crosses the cavern. As the party finish crossing the crevasse a band of Demons appear from one of the many passages leading into the chamber, 40' away.
Roll initiative.
The faerzess of the room interferes with spellcasting. Creatures must pass a DC 15 intelligence (arcana) check to use conjuration or divination magic of any kind. On a failure the spell slot is expended but nothing happens. The room is shrouded with dim light. Stalagmites and stalagtites litter the room, providing patches of cover, and areas of difficult terrain.
They are a demonic warband raiding, not sitting in a cavern waiting for someone to come along. That is just as much a part of fantasy as a monster sitting in a cavern.
You impose these restrictions on your monsters, yet happily run your PCs as a bunch of soulless murderhobos who only ever use optimal tactics?
No. I vary tactics according to the monster and circumstances.
From the monsters postion, whose in robes? Who looks the most like a vulnerable spellcaster to the monsters? Who have they seen casting spells? Failing that, who looks like the easiest to tear apart, or who is doing the most damage?
As I pointed out, no one is in robes. One character has a familiar. The bladesinger wizard.
That said, your players sound like they dont hold back, routinely taking the most optimal choices (regardless of character knowledge), ganing up on monsters, targetting weak saves, targetting the most optimal targets and metagaming the heck out of stuff. Looking at the battle through the eyes of the players and not the characters.
No. They choose an optimal base attack. They only attack weak saves if it is obvious. They don't know the weak saves of all creatures. Giants are a good bet weak wisdom save. Polymorph works against almost all types of brutes.
Optimizing is about choosing abilities that work against the largest number of encounters with the highest percentage chance of success. Metagaming is choosing to attack weak saves and using player knowledge. Optimizing and metagaming are very different. I generally don't allow metagaming. I can't do much about optimizing. Some abilities work better against more things than others. Players tend to choose those abilities.
They wanna do that kind of crap? Do it back to them. Pick on the PC with the lowest AC and wail on him with everything you have. If they complain about how the monsters always seem to know this, let them know the monsters are making the same complaints.
Im only being half serious here. But you as DM should know who is the weakest or most vulnerable, and you as the DM are the one that is allowed to metagame to challenge your players. If theyre having too easy a time of it, do just this. Heck; they certinaly do it themselves so they cant complain.
I do. The beholder cave I had them fight an eye tyrant in was created so the eye tyrant could move to full cover and blast with eye rays. One PC was dropped and another was nearly laid low. One of them got real pissy when he tried to drink a greater healing potion in the Death Tyrant's cone. Started arguing with me he would have known even though he had an active blink on and was in the ethereal plane when the Death Tyrant activated his cone. He wanted me to draw the cone on the board. As far as I know beholder cones aren't visible, so he didn't get to have that information. It was pretty irritating.
Great, you can have an AC of 26 with full plate, shield, defensive style and the shield spell. So only a 36 percent chance of hitting per attack at +9 with advantage. Hardly what I would call invincible.
Not against the marilith, but pretty high against the other stuff.
Your bladesinger is AC 31? Awesome. Hows his Con save looking vs several volleys of Stunning screech, poison and spores? He's bound to fail a DC 14 Con save at some point. Also - hows his Str (athletics) looking when the Hezrou shove him into the crevasse?
He has resilient Con. He gets to add his intelligence bonus to Con checks for concentration. He has Acrobatics to resist grapple checks as a Dex based character. It's possible to grapple him, but not easy. He also has misty step, so it would have to happen pretty quick and work or he'll have them dead.
These Demons are sure pretty dumb.
They are Chaotic Evil and were overconfident given they had been killing most humanoid parties in their path pretty easily. I pictured them like a roving band of savages caught up in the ecstasy of their power thinking, "These little humanoids are our meat." I have a bit more dangerous series of demon encounters coming up in the Spiral of the Horned King. The environment in there is not kind. I'm a little worried they might die. But everything can't go their way, right?
You (as DM) are letting the PCs dictate the encounter conditions. Stop it. You're the DM. You're the one in charge of where battles take place. If your battles arent challenging the PCs, this is one thing you can control to fix it.
Youre there to set challenges appropriate to your party compostion, experience and level. Set them.
This particular encounter I considered environment neutral. Neither side had an environmental advantage. They met 120 feet apart in an Underdark tunnel.
First he has to avoid getting stunned. He also has to save against being poisoned. Maybe a few saves against stench as well if the Hezrous get close. Not everyone is within 10' of the Paladin, and even then he's bound to fail one of the half dozen DC14 Con saves coming his way.
DC 14 Con save isn't very high when you have Resilient Con and a paladin aura. I think only the cleric has no proficiency on his Con save, but he has a high Con. But he is easy to grapple.
The Vrock makes an attack at +6 (with advantage) against the archers choice of strength athletics or dex acrobatics. It then uses its free object ineraction to kick the bow into the crevasse behind the archer.
If the party prove hard to hit, and hit back hard, this is most definately an option.[/FONT][/COLOR]
Disarm? We do have those optional rules. But he's an eldritch knight with that one ability...what do they call it...weapon bond? He can't be disarmed and he can call his bow back to him as a bonus action. You see how many bases they have covered? I have to think up all this stuff every battle often on the fly. That was a fun ability to learn about. The Sharpshooter is the guy with his nose in the books all the time. He's probably the top optimizer in the group. Always has something up his sleeve, though he's gotten a few rules interpretations wrongs (but so have I, it happens) fortunately. He just loves finding some tactic to make life hard on me. Keeps it to himself all week sometimes too and springs it on me on gameday. Keeps me on my toes I guess.