Oxygen is one of the many recurring Skill Trees in the Monster Hunter series. This Skill Tree first appeared in Monster Hunter Tri.
Oxygen has appeared in the following games:
|Skill Tree||Skill Name||Points||Skill Description|
| Endless Oxygen|
|+10||Stops depletion of the Oxygen Gauge.|
| Short Breath|
|-10||Speeds up depletion of the Oxygen Gauge.|
MH3U Equipment with Oxygen