From WoWWiki

Overview

This spell allows a Warlock (or its target) to see invisible units so it can attack them. Detect Invisibility does NOT allow you to see stealthed units.

Previously there were Detect Lesser Invisibility and Detect Greater Invisibility. However, those two spells have been removed from the game. Currently only one level of Detect Invisibility spell is available in game.

Functionality

• Level Req: 26
• Mana Cost: 8% of Base Mana
• School: Shadow
• Type: Demonology
• Duration: 10 minutes
• Training Cost: 1 

Tips

Detect Invisibility is needed to see some of the succubi in the Arcatraz where the second and third bosses are.

In PvP, Detect Invisibility allows buffed players to see mages who are using the Invisibility spell. However, the buff also allows invisible mages to see the buffed player.

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Classes • Warlock • Warlock Abilities • Warlock Talents • Warlock Tactics