Traits
From Tiny Rogues Wiki
Traits are special buffs that players can choose from a random pool upon leveling up. Each run you can choose up to 6 different traits and you can use Ethereal Dice to reroll traits or Obsidian Dice to change a trait into a random one. You may also find Tomes with random traits that allow you replace a current trait with the Tome trait.
Most traits are placed in the pool with no special triggers, while some require triggers for the trait to appear. For example Shield based traits will not appear until you are wearing a shield. There are also certain class only traits such as the Super Hero, Esper and Cyborg.