c7b27db1_Borderlands_2_Wiki_Guide___IGN__Description
[Skill] Delusional Damage [Tier] 3 [Levels] 1 [Description] 
All Elemental Status Effects you cause have a chance to light yourself on fire. Ignite chances are determined by these accumulated from Burn, Baby, Burn and Fuel the Fire. (Elemental Status Effects are damage over time from Corrosive, Electrocute, Slag and Burn damage.)
Psycho (Class) - Borderlands 2 Wiki Guide - IGN