Enchantments Encore adds 140+ enchantments to the game which can be obtained in any vanilla way. Some are obtainable in loot chests or in an enchanting table, others are tradable at villager. Even mobs can spawn with some of the new enchantments on their equipment. A full list of all enchantments with a brief description and other details can be found here: Enchantments Overview
The data pack also adds a unique Structure (Rise) which has always a guaranteed enchantment from this data pack in it.