"Insanity is the secondary resource for Shadow priests"
Insanity (removed)
Level 45 Shadow priest talent
Passive
Consuming Shadow Orbs transforms your Mind Flay into Insanity, and your Mind Sear into Searing Insanity, for 2 sec per Shadow Orb consumed. These spells deals 100% additional damage.
Mastery: Madness (removed)
Level 78 Shadow priest ability
Passive
Increases the damage of your Shadow Word: Pain, Vampiric Touch, Mind Blast, Mind Flay, Mind Sear, Void Eruption, and Void Bolt by 9.6%.
Death and Madness
Talent
Requires Priest (Shadow)
Requires level 15
If a target dies within 7 sec after being struck by your Shadow Word: Death, you gain 40 Insanity over 4 sec and the cooldown of your Shadow Word: Death is reset.
Ancient Madness
Talent
Requires Priest (Shadow)
Requires level 50
Voidform increases your critical strike chance by 30% for 15 sec, reducing by 2% every sec.
Surrender to Madness
Instant 3 min cooldown
Requires Priest
All your Insanity-generating abilities generate 100% more Insanity and you can cast while moving for 1 min.
Then, you take damage equal to 90% of your maximum health and cannot generate Insanity for 15 sec.
Driven to Madness PvP Talent
Tank Specs – Row 1 PvP Talent
Requires Priest (Shadow)
Requires level 23
While Voidform is not active, being attacked will reduce the cooldown of Void Eruption by 3 sec.