Demon bred hydra body
Level 3 Wrecker
AC 19 PD 17 MD 13
The body of the hydra stays in its pool of brackish, disgusting water. Enemies in the demon tainted water take 5 necrotic damage if they end their turn in the water. And probably have to roll a background check (DC 15) to stay swimming and still fight. If they fail, they they spend their standard action simply staying afloat. Most of the time, you’ll have to get in the water to engage the hydra body, but you might swing on ropes or float on wooden rafts or come up with some other clever plan.
Crushing Claw +8 vs AC. Hit: 10 necrotic damage. Any even hit: The target is knocked into the brackish, disgusting water. Miss: 2 damage
Hold Under Water: If a target is in the water at the start of the hydra’s turn, it will hold the target under water as its standard action. The target takes 6 damage per turn and has to make last gasp saves to keep from drowning. (Ie, the target only gets one action per round, and the have to roll a hard save to keep from getting worse. On a success, you shake off the condition. On a failure, you are unconscious and have to start making death saves (16+). 16+ means spend a recovery and regain consciousness, 20 means you do that and can take your turn as normal. After four failures, you die.)
All One Being: When the Hydra Body is hit by a status effect, it can transfer that effect to one surviving Hydra Head.
Regrow Heads: Each round, roll a d4. If the result is equal to or lower than the escalation die, the hydra grows a new Hydra Head. After the hydra has grown a new head through this ability, use a d6 from there on, then a d8 and so forth.
Resist energy 12+. Attacks with an energy type that roll a 11 or lower do only half damage to the hydra body. (The heads are normally vulnerable.) For necrotic and poison damage, resistance is 16+.
Level 2 mooks (blockers)
AC 18 PD 15 MD 13
HP: 9 each
Clamping Bite +8 vs AC. Hit: 3+escalation die damage and the jaw clamps down on you. Until you disengage (at a -4 penalty), you cannot move away from the hydra head, you cannot make opportunity attacks and a -4 to hit any enemy that is not a Hydra Head biting you. Hydra Heads biting you get a +2 to hit you.
Tear Apart: If two Hydra Heads are biting you, they can both work together to try to tear you apart. This is the attack for both Heads. +8 vs. PD (+10 with the bonus from Clamping Bite); 6 damage and 5 ongoing damage (normal save ends).
Mass of Whipping Heads: Once per round when an attack targets the hydra body and the attack roll is odd, a hydra head gets in the way and takes the attack instead.
Mooks. As mooks, they share a pool of HPs. Kill a head for every 9 damage the heads take.
The Hydra’s Secret Weapon: When you kill a hydra head and the attack die result is odd, the hydra heads regrows two new heads.
Death Frenzy if the Hydra Body dies, then all remaining Hydra Heads get a +2 to hit for the rest of the battle.