The Grugbug Mushroom is one of the many harvestables that can be found in the Frontier. They are often seen by itself, although it is possible to see it within range of one another. They can be found in various locations of the Frontier that include the following:
- Blackrock Mountain
- Farm Fortress
- Greenhorn Grove
- Red Ant Cove
- The Deep Forest
- The Far Coast
- Upper Island
The Grugbug Mushroom is an orange mushroom possessing a pale orange cap dotted with yellow spots. A thin, red stem can be seen supporting the large cap. Two smaller yellow dots can be seen above the foundation of the cap, acting as the eyes of a semi-living creature.
It is possible for players to exchange Grugbug Mushrooms for gold during Slayer's Tasks if the task card is currently active. Other than that, it can be sold to a selling vendor at a selling price of 5,000 gold.
- It is sometimes mixed up with the Brain Mushroom.
- The word Grugbug contains the root word 'bug', referring to some sorts of insect that is possibly allured by one of the mushroom's properties.