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
430β580 HP
5 AP
3 MP
5β9%
-10β-6%
0%
11β15%
12β20%
Black Wabbit
Lvl 46 to 54
500β650 HP
5 AP
4 MP
10β14%
-5β-1%
5β9%
11β15%
12β20%
Gwandpa Wabbit
Grand Pa Wabbit
Lvl 52 to 60
920β1200 HP
6 AP
3 MP
18β26%
0%
-15β-11%
11β15%
0%
Tiwabbit
Lvl 41 to 49
420β560 HP
5 AP
4 MP
2β10%
1β5%
0%
-5β-1%
0%
Tiwabbit Wosungwee
Tiwabbit Kiafin
Lvl 40 to 48
400β540 HP
4 AP
5 MP
12β20%
0%
0%
0%
0%
Wabbit
Lvl 44 to 52
470β610 HP
5 AP
4 MP
10β14%
5β9%
0%
-5β-1%
0%
Wo Wabbit
Lvl 52 to 60
610β780 HP
6 AP
3 MP
18β26%
18β26%
10β14%
-15β-11%
0%
Rooms
Room 1
Room 2
Room 3
Boss
Wa Wabbit β
Lvl 60
3000β4500 HP
10 AP
4 MP
28%
28%
18%
-7%
-12%
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: