Impact (Skyrim)

Impact is a Destruction perk in.

Usefulness
Impact will always stagger an opponent when using high powered spells such as Thunderbolt, Incinerate and Icy Spear in conjunction with the appropriate Augmented perks. With enough magicka or cost reductions this makes it possible to keep any enemy in a state commonly referred to as "stun lock" whereas they are unable to attack or defend themselves.

It will work on large creatures that are normally resistant to being staggered, such as Dragons (including Alduin) and Mammoths. With this perk, high powered destruction spells become the only ranged attack capable of a 100% stagger effect and the only ranged attacks capable of staggering massive creatures. The archery skill trees Power Shot does not stagger massive creatures and only has a 75% stagger when used in conjunction with Force Without Effort).