Rain of Fire

Were you looking for the Doomguard ability also called Rain of Fire?

Rain of Fire
Rain of Fire (7 ranks) Warlock ability 57% of base mana Channeled Calls down a fiery rain to burn enemies in the area of effect for X Fire damage over 8 seconds.
Properties
Class	Warlock
School	Fire
Cooldown	None/Global Cooldown
Improvements	Intensity, [Pyroclasm], Cataclysm, [Aftermath], [Destructive Reach], Emberstorm

This is the rain that falls in the Twisted Nether.

Rain of Fire is the standard warlock Area of Effect spell. Talent points in Intensity increases the chance to avoid interruption when the caster is hit.

Rank	Level	AoE Damage Dmg over 8 sec	Cost
1	20	168	20
2	34	384	1 10
3	46	620	2 20
4	58	904	4 30
5	69	1212	6 30
6	72	2152	16
7	79	3112	16

Background

Rain of Fire is an arcane spell used by conjurers, mages, sorcerers, wizards, and warlocks. Originally a spell created by the Conjurers of Azeroth, and other casters, it was later used by warlocks.

This is a very powerful spell that combines the natures of flame and water. It calls forth the essence of fire and delivers it through massive thunderheads of vapor and brimstone, creating an actual firestorm. This spell is very destructive, and will cause damage to any foes and buildings in its sphere of influence. Use this spell with care, for the rain of fire knows no friends. Small meteorites rain from the sky, exploding on impact and burning all in their wake . Meteorites deal impact and fire damage to creatures, ignite and batter objects.

Notes

• As an AoE spell, Rain of Fire receives 33% of the bonus from +damage gear for each tick. For example, if you have +100 damage gear, each tick of Rain of Fire will get +33 damage, or +16.5 damage per second. Rain of Fire has 4 ticks total.
• [Pyroclasm] can give add 3.25% chance to stun per second to this spell No longer true as of 2009-04-14
• Very situational, for it's easy to interrupt by mobs attacking you, pulls threat and costs a lot of mana. Mainly useful in instances for AoE.
• In Netherstorm one quest has you breaking Seeping Sludges and Void Waistes into globules and killing the resulting globules. The Void Waiste globules deal only shadow damage and therefore Rain of Fire can be very useful against them in conjunction with Shadow Ward.