The way to get new abilities in Ender Lilies is to find and acquire new spirits. Check out this Ender Lilies spirit location guide to find them all while you go through the game. This way you will know if you missed one or not.
Ender Lilies Spirit Location Guide
Beat the creature and purify it to gain it as a spirit. You can equip it at any resting area.
Beat the boss and purify it to get it on your team. This one summons a bird to fight by your side.
The area is near the Witch’s Alcove fast travel.
This area is near the Crystal Lake fast travel point. Head to the area below where I am and go to the top of that area. You character will sort of be cut off if you are in the right spot. Jump up and there is another area above where you can find the Fungal Sorcerer.