Edron, south-east of Telas’ house.
To do this, use your Slime Gobbler on the Slime Fungus and you will receive a message. Note: you must wait 5 seconds after one use to use your Slime Gobbler again.
The Mad Mage appears spawns after 20 waves of golem servants.
The Mad Mage appears in one of the three marked locations.