D&D4 Wiki
Call lightning
druid attack 3

Bolts of lightning spear your foes as thunder rumbles around them, distracting them and threatening to blast them if they move away.

area burst 1 within 10

Target: each creature within the burst

Attack: Wisdom vs. Reflex

Hit: 1d8 + Wisdom modifier lightning damage.

Effect: The burst creates a zone that lasts until the end of the user's next turn. Any enemy within the zone takes a −2 penalty to attack rolls. Any enemy that leaves the zone takes 5 thunder damage.

Call lightning is a 3rd-level druid encounter attack power. It deals lightning damage to creatures within its burst that it hits. It also creates a zone that inflicts an attack roll penalty to enemies within it, and deals thunder damage to enemies that leave it.[PH2:87]