Taunt causes an affected enemy to focus aggro – spells, attacks and movement – on the character that inflicted it for 3 seconds. Taunted enemies deal 10% less damage to targets that aren’t the source of the taunt (including in PvP). Taunt immediately expires when the character that applied it dies.
When multiple players are taunting the same enemy, the first person to taunt takes aggro. The targeted player can maintain aggro indefinitely as long as it maintains its taunt on the target.
Taunt does not cause The Shaper, The Elder, each Guardian of the Void, and Elder Guardians to retarget.