Agni

Agni is the fire-charged branch of the Kodama line. It is a bright hovering core that escalates much faster than an ordinary Kodama and ends fights with an explosion.

It becomes aggressive at a much lower anger threshold, burns on hit, and detonates on death. The burst is the part to respect. Even a clean kill can still punish melee range if you stay on top of it. If you want to stay out of melee range, a mid-range gun such as tathlum tack or needle shot can be useful. The hate wand is another viable option, though if you aren't careful you may wind up missing the Agni, blowing yourself up regardless, or possibly doing both.

Agni appears in Anger, Prison, Aether, and Rosary. It always drops fire, so the fight has a straightforward payoff if you can finish it without standing in the blast.