Wikia

Cataclysm
Reduces the mana cost of your Destruction spells by X%.
Usable by
Class	Warlock
Properties
Location	Destruction, Tier 2
Affects	All Destruction spells: Shadow Bolt, Immolate and other fire damage spells, etc.
Ranks	3
Requirements
Points required	5
Spec specific	Yes

Cataclysm may also refer to the Great Sundering, the destruction of Draenor, or the third expansion to World of Warcraft.

Cataclysm is a warlock talent that reduces the mana cost of Destruction spells by 4%, 7%, or 10%.

Rank table

Patch 3.1.0 (14-Apr-2009): Now reduces the mana cost of Destruction spells by 4/7/10%. No longer increases the chance to hit.