To get mushroom moon bolts in Tribes of Midgard you will need to pick lunar stormcamp mushrooms.
You can find these mushrooms inside the land of pools region when it is night, and you locate the mushroomas it will glow a light blue.
Picking these mushrooms will give you both mushroom oil and mushroom moon bolts. But this method is not the only way to get moon bolts in the game.
You can also find them in the various treasure chests located inside camps guarded by annoying goblins in the land of pools.
These camps can be found via campfire icons; check both your mini-map and main map, and you should be able to find them.
Camps will also come in various sizes, and the bigger the camp, the higher the number of resources and the higher tier variant of treasure chest there will be inside the camp.
But you should raise your power level before tackling one of these camps as they can often have trolls that are a pain to kill if guarded by hordes of goblins.
That said, you can raise your power level by getting better gear and leveling up.
Check out some more Tribes of Midgard guides at Pro Game Guides!