Firecaller is an enemy added in Revelations Chapter 2.
During Firecaller's first phase, he will walk around the room randomly and occasionally attack, causing a homing tear to shoot from any brazier fires located in corners of the room. If there are any fires in the room, those fires will glow purple for a second and also send out a homing tear towards the player during the attack. During Firecaller's second phase, which begins when his health has been depleted, he will fall to the floor and become stationary, occasionally firing a single homing tear at the player when he gets near.
Caution is advised when knocking him into his second phase as if he is the last Firecaller in the room, he will cause all fireplaces in the room to burst into rings of fire projectiles that can travel over rocks.