β‘ Quick Strategy (TL;DR)
This is a straightforward fight with no complex mechanics, simply defeat the Wa Wabbit and his minions.
To get to the island, see this article.
If you haven't done it yet, start the quest "Never Two Without Three", which lets you collect the 3 local keys needed to craft the dungeon key and get the "Eat a Cawwot" emote at the end of the dungeon.
The hardest part of this epic dungeon is... getting there! Don't worry, Papycha has it all covered =) Here's the path to Wa Wabbit's Castle.
Monsters
Black Tiwabbit
Lvl 42 to 50
Black Wabbit
Lvl 46 to 54
Gwandpa Wabbit
Grand Pa Wabbit
Lvl 52 to 60
Tiwabbit
Lvl 41 to 49
Tiwabbit Wosungwee
Tiwabbit Kiafin
Lvl 40 to 48
Wabbit
Lvl 44 to 52
Wo Wabbit
Lvl 52 to 60
Rooms
Room 1
Room 2
Room 3
Boss
Wa Wabbit β
Lvl 60
End of the dungeon
And there you go, you're a kingslayer too, just like Jaime Lannister hehe... Nah, he's not even dead. In fact, talk to him to leave the dungeon: