Simple, Editable Particle Effects. Has Triangle, Circle, Spiral, Sphere, Line, Oval, and Cone!
Open the file and change the particle type as you like.

The scale of shape, and speed of spiral can be changed manually.

Update 1. The Skills!

You can get figure of how to make skills with these effects. Currently there are 4:

Dome - drop it to activate. It will give wither to anyone in the circle!

Shield - drop to activate. It will give you resistance for a moment.

Magician - name a villager 'magician', and it will strike lightning to nearby enemies.

Railgun - Shoot with railgun. It leaves spiral effect with cool explosions!