From Brotato Wiki
XP Gain
"XP Gain" is a hidden Item Tag for certain Items in the Shop. It's applied to items related to gaining XP (to level up faster and acquire more Upgrades).
The character(s) 
Apprentice, 
Baby, 
Captain, 
Creature, 
Mutant have a higher chance to find these items in the Shop.
Items tagged with "XP Gain"
| Name | Rarity | Effects | Base Price | Limit | Unlocked By | Tags |
|---|---|---|---|---|---|---|
| Tier 3 | +50 % XP Gain -2 % Life Steal |
70 | XP Gain | |||
| Tier 2 | +25 % XP Gain +3 Melee Damage +3 Knockback -8 Luck |
50 | Melee Damage, XP Gain, Knockback | |||
| Tier 4 | +10 Engineering +50 % XP Gain -3 Max HP |
90 | Engineering, XP Gain | |||
| Tier 3 | +25 % XP Gain +100 % XP Gain during the next wave +50 % Enemy damage during the next wave |
50 | XP Gain | |||
| Tier 1 | +20 % XP Gain -8 Range |
25 | XP Gain |
