Help on spell firewall

Current upkeeper: Morpher
Casting time    : 6
Spell cost      : 300
Spell type      : generic
Affecting stats : Wis, Int
Affecting skills: Arcane power, Energy focus
Affecting spells: This spell
this spell allows a warlock to create a wall of fire to block a single exit
from the room. Going through the wall will cause horrendous burns to the
brave fool.

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