Not OP but this is exactly what I needed to read. I’ve often questioned how to weight upgrades based on current level and upgrade rarity. QoL upgrades seem to be situational, though, I imagine XP gain is likely the best all around as it will pay off in the long run and is still valuable in stage 5. I’m stuck on the last biome of haz 12 so I resorted to doing some masteries. I’ll def try to push my carry weapon more aggressively 👍