Bustling Fungus

The Bustling Fungus is a returning item in Risk of Rain 2. It creates a green bubble which heals players for 4.5% health every second after the user stands still for 2 or more seconds. Both the radius and healing amount can be increased by stacking, up to a maximum of 100+% healing every second at 44 Bustling Fungi and with no effective limit on radius.

Having 44 Bustling Fungus will reach more than 100% healing, which is effectively a soft cap without items using overhealing such as Aegis.

This item is extremely powerful to stack as Engineer, due to his turrets' ability to inherit his item inventory and their immobility making the healing bubble persist wherever the turret is placed, however it is almost completely useless for every other survivor. As such, this item should be saved for an Engineer on your team if you're playing multiplayer.

The healing dispensed normally scales with the max health of the holder, the max health of teammates is irrelevant to the healing they receive, except for the Engineer and his turrets. Through testing with Infusion, if the max health of his turrets differ from his own then the healing zone from his turrets will heal him scaling with his own max health and vice versa.