Johnny Hollowlegs

 is the penultimate boss of the Hobo Colony chapter. The undead original Hobo King is quite the challenge.

Attacks
Johnny's attacks are randomly selected whenever he is in range of you (and he will try to get in range as often as possible). One of them is a sweeping attack that can hit multiple heroes, the other a single overhead swing that deals tons of damage in a small area in front of him. Though technically not his own attack, Johnny also brings a host of respawning Mulligan's Men to the fight and summons fire bursts (coming from the grating below the throne room) that deal tons of damage. Oh, and did we mention that he has a truckload of hit points?

Strategy
Hollowlegs is by far the most challenging boss in the game. An effective strategy involves lots of luck, maneuvering, and dealing a constant stream of damage. High DPS characters are recommended, as they can effectively remove his support and a chunk of J's health with it. The real problem comes from the fact that the arena is quite small and it's easy to become boxed in. Unless your hero has some way to get out of the corner they're stuck in, Johnny will ruin their day.

Stay on the move, avoid him, and try not to get incinerated by the fire bursts he will summon once he's down on his health.