Here are some summons. Which requires essences.
What are essences?
Essences are Endlessmode items used for crafting many useful stuff.
They can also be dropped by Hardmode-Optional bosses.
They're like Sentry Summons, but instead when they spot an enemy they attack them.
Glided Food - Summons a Baby Glider which attacks by jumping and gliding at the enemy.
Barracuda Staff - Summons a Barracuda Launcher which launches Barracuda.
13 Bulbs to That Way - Summons either a red or blue Plantera Bulb. Red has a chance to burn, while Blue has a chance to freeze.
Upgraded Biome Weapons!
Pirahna Gun -> Derp Gun -> Arapiama Gun -> Shark Spitter
Staff of Frost Hydra -> Staff of Sleet Hydra -> Staff of Frost Dragon -> Wand of Permafrost Wyvern
Scourge of the Corrupter -> Scourge of the Waster -> Scourge of the World Corrupter -> Scourge of the Destroyer
Vampire Knives -> Vampire Stakes -> Count Knives -> Dracula Blades
Rainbow Gun -> Rainbow Repeater -> Rainbow Mini-Gun -> Fairy-Tale's Good Luck