Lightning strike
Lightning strike is a special ability of Thunderbirds. According to the game manual, every time a stack of Thunderbirds attacks (including retaliation), there is a 20% chance thunderbolts will strike their target, delivering additional damage ten times the number of attacking thunderbirds. The thunderbolts have the same visual effect as the spell Lightning Bolt, and the special attack is also counted as one in terms of immunities.
Creatures with lighting strike special ability: