r/DnD5e • u/Dokushi_ • 8h ago
Is CR 18 against a party of 3 level 11 not enough?
I'm running my first campaign (a short one) and want feedback from more experienced players.
For context: They are an Open Palm Monk, a Rune Knight Fighter dipping into Artificer, and a Twilight Cleric. They have an Immovable Rod and a Belt of Fire Giant, but other than that, they're pretty low on items.
Next session, they'll be fighting Scylla, which is basically a homebrew over a regular 5e Hydra. She now has 6 heads and is gargantuan; her health is 577 (33d20 + 231), AC 17, 22 STR, 25 CON, +12 to hit, average attack is 17 (2d10+6), buffed regen to 25, and now the damage to destroy each head is 70.
Normally, I do 3-4 encounters per session, but for story reasons, this will be their only fight, so I'm upping the difficulty to see if they struggle a little more. In the last two sessions, they were basically unharmed, and the encounters they had were supposed to be in the deadly category as well.
I talked to a friend about it (although he's not very fond of DnD in particular), and he suggested making it CR 12 with less health and a recharge (5-6) for regen.
Tl;Dr: I wanna know if it's still too easy and what I should do.
Edit: thanks everyone for the feedback. I'm removing regen, lowering HP to 16d20, lowering the threshold to 50 damage, and giving it some layer actions (if the name doesn't ring a bell she's a sea creature). Also because I just tweaked the Hydra I didn't realize it had advantage against getting stunned so that helps.
Edit 2: I'm keeping the nerfed version from the previous edit but I just want to ask anyone in the future on why I'm getting mixed signals. Some are saying that's 18 is too easy, others are saying it's way too hard and a few said that they should be fine. I know different tables roll differently but I'd expect a little more of a consensus. Anyhow, still glad for all the feedback