Undead Dragons Quest
From Realera Wiki
Name: Undead Dragons Quest.
Location: Anvers.
Reward: Blue Diamond, a Red Diamond and a Skull Helmet.
Requirements: Anvers Island Quest, level 100, Pick, Rope, Shovel.
Monsters: Skeleton, Ghoul, Mummy, Crypt Shambler, Demon Skeleton, Vampire, Beholder, Elder Beholder, Bonebeast, Braindeath, Undead Dragon.
Spoiler:
Here is the 100 level gate.