Roc and Thunderbird
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Rocs and Thunderbirds are the level 5 creatures of Stronghold. They are recruited from the Cliff Nest.
"Rocs and thunderbirds are the only flying units available at Stronghold towns. When thunderbirds attack, there is a 20% chance thunderbolts will strike their target, delivering 10x the number of attacking thunderbirds in additional damage." RoE manual
Dwellings & Portraits
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Heroes with a specialty
Special Ability: Lightning Strike
Thunderbirds have special ability lightning strike, which has 20% probability to occur after the stack have attacked, including retaliations. When the stack attacks, the lightning strike occurs before the enemy has a chance to retaliate. If successful, the lightning strike deals additional damage for the amount of 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 and Golems' spell damage reduction (e.g. if 14 Thunderbirds attack a stack of Diamond Golems with a lightning strike, they will do 7 damage instead of 140 because Diamond Golems have 95% spell damage resistance). Since the attack is considered to be the Lightning Bolt spell, it also deals extra damage to 
Air and Storm Elementals.
