Demon Firesage

 is a boss similar in looks to the Asylum Demon and Stray Demon. The Demon Firesage is made optional through the use of the Chaos Servant covenant shortcut.

Strategy
The Demon Firesage is very similar in terms of moveset and attacks to the Stray Demon, so the same rules apply here: staying behind it and keeping a shield up should damage be unavoidable are good ideas. Be wary of its overhead attacks that are blockable, but deal heavy stamina damage.

The Demon Firesage is highly susceptible to Bleed buildup.

Getting too far away from it will cause it to either leap at the player with its hammer (Leaping Hammer Smash), or do a straight down smash (Hammer Smash), which can take away a large chunk of stamina or most, if not all, of one's health if the player isn't blocking. Note that both of those attacks do not track, so with proper timing, one can easily roll through their smashes.

Butt Slam
It will fly up into the air to perform this attack.

Exploding Swing
It will only affect the area in front of it and being behind it is a safe zone.

Exploding Hammer Drive
It smashes its hammer into the ground. Affects the area all around it.