I had the pleasure of being responsible for the bosses in the master quest, Desert Treasure II in Oldschool Runescape.
A vault was sealed by 4 important zarosians with four medallions made from a piece of their soul. Each medallion is to be collected.
Vardorvis, a former Zarosian executioner who hid in the Strangler Woods. Found and executed by the dwarves with his own axe. And as his body decomposed, the Strangler paracite found a new powerful host.
The Whisperer, a key assassin and a siren, tasked to collect rare, powerful items and bring it to the vault. Who sheltered in Lassar Undercity during the seige. With her; the Black totem tainted with an evil magic, she was left corrupted by its shadow, doing its biddings. Luring the population deep into the undercity and devoured them.
The Leviathan, a massive sea creature that was pulled into The Scar when it first opened 5000 years ago. The holder of the third medallion was Perseriya, who was on a Zarosian fleet when the rift opened, pulling her into the brainy void. Here she was devoured by the Leviathan.
Duke Sucellus, the father of abominations, a Chtonian Demon who built Ghorrock Prison. After the God Wars, he felt it was time to restore the empire. He thought the power needed to restore the empire would require him to devour the remaining Zarosians seeking shelter in the prison. And his hunger didn't stop; he grew big enough to fill a massive section of the prison.
Official Concept art for Old School Runescape. Copyright © Jagex 2023.