Skript-Paper is a new Skript add-on that gives you even more syntaxes, using the PaperAPI.
For example:
on beacon effect:
on projectile collide:
on enderman attack player:
on witch consume potion:
on witch throw potion:
on turtle lay egg:
on player elytra boost:
https://forums.skunity.com/resources/skript-paper.709/
The addon requires PaperAPI.
https://papermc.io/