The Fungus is Fungone
The Fungus is Fungone is a members achievement in the Skills category (Skilling Boss Croesus), worth 5 RuneScore points. It has no requirements.
In game: “Slow down the regrowth of fungus on a dead creature during a Croesus encounter. (X/1)”
5 RuneScoreSkillsSkilling Boss CroesusMembers
Updated . From the RuneScape Wiki's achievement data (CC BY-NC-SA 3.0), checked 2026-10-09. Wiki page.
Requirements
None: any account can do this one as soon as it reaches the right place.