Impact
100 yd range
Instant
Fire spells have a chance to stun the target for 2 sec.
Learned from the Mage trainer at level 10

Fire spells have a chance to stun the target for 2 sec.
Impact is a talent in the Fire tree (row 2). You get the first rank from the talent; higher ranks are then bought from the trainer. Open the calculator →
From game client 1.60.1.70755. Numbers without gear bonuses; values that can't be computed from the client data are shown as X.