AoE damage dealt by this unit and this unit's summons is increased by 5%. If the damage dealt is AoE Corrosion damage, then it is further increased by 5%.
Corrosion damage dealt by all allied units is increased by 10%. For each unit summoned, Corrosion damage dealt by this unit and this unit's summon is increased by 5%/7%/9%/11%/13%/15%, up to a maximum of 15%/21%/27%/33%/39%/45%.