Help on spell black rain

Current upkeeper: Xiao
Casting time    : 10
Spell cost      : 1
Spell type      : offensive (area)
Spell words     : exiema drk fld
Affecting stats : Int, Wis, Lvl
Affecting skills: Arcane power, Energy focus
Affecting spells: Black rain
A conjurer can summon a dark cloud in order to create a massive
suffering to the beings present as a form of black rain.
These rain drops are known to contain very different types of 
chemicals.

Black nova < List > Blade of hrwack