Gravity Pulse is an utility enchantment that goes on armor items.
Enchantment book
The Gravity Pulse book grants level I and has unlimited uses. The Enchantsmith applies its enchantment and upgrades it to II and III as the vendor levels up. Enchanting needs Echo Shards and Enchantment Points. Enchantsmith: Brave Haven, Howling Woods, Frozen Highlands and Rainy Plains.
The Gravity Pulse book drops in the loot of Ravines.
