The Hydra: an alternate view
Here’s a slightly odd take on a solution to the hydra problem for 4e. A standard level 12 encounter for 4 PCs would feature (1) Hydra, (1) Skulking Hydra Head, and (4) minion Hydra Heads for a 6-headed hydra. I had to create a new mechanic for multiple monsters sharing a single body. It should, I hope, be self-explanatory. Hydra...