Can you "stack" advancement bonuses, such as *1damage, to treasure cards?
Advancement tokens may be used in addition to buffs from items, but only once per game.
Rules, p. 14 wrote:
✦ +1 Damage: This token can be used after you hit with an attack to deal +1 damage.
Once you have purchased an Advancement token, you may use it as noted during an adventure. It does not take an action. After you use it, flip it over and it becomes inaccessible until the next adventure.