There's a Loop Hero easter egg enemy where you can buy a trait that let's you spawn a secret enemy that steals your traits back.
If you already have all but two (or one) of your traits purchased and get another level, then see the reroll 3 traits perk by random chance, if you reroll the traits there won't be 3 to give since you only have 2 traits left to buy. When this happens the game instead offers you a trait called %=/*+ which will place some red lines on a tile on the map. When you pass this tile it will trigger an enemy encounter with the name %:1/
This enemy will take a trait from you with each attack it his. This Loop Hero secret enemy is definitely an easter egg meant to troll people who cheated for infinite levels in Loop Hero.
This is a really funny Loop Hero cheat that you should check out if you have the time.
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