Posted on my brother's behalf. Everything from here is written by HorseClaw.
So basically the Epialitzer is a giant Howlitzer, who has 2 main stages, Normal and Kamikaze. The boss would probably be at Tier 3. A screenshot of the battle field is here (it was created in Spiral Spy): https://pinterest.com/pin/529806343633880821/ .
Attacks (of part one):
Shoot
Summon curse zombies and Howlitzers that are slightly larger than normal
Destroy all Howlitzers in the room, making them go into Kamikaze mode, then respawns them
Summons spikes at random locations (the areas will glow before the spikes comes up)
Attacks (of part two):
Dash around the room (does this constantly)
Summon curse zombies and Howlitzer that are larger than normal
Make all Howlitzers go kamikaze, and respawn them
Bullet spray (they trail him, then spread)
On death: the Epialitzer's skull explodes, killing all monsters in the room. He also drops Haunted skulls.
I don't care what the swarm version will look like (if one ends up existing), I just would like people to consider this idea.
1 needs location.
2 well, good mechanics. phase 2 is based on damage or on time?