Geniemon Training

A Trait is not rolled, it is passed on. Geniemon Training takes a Trait held by an inactive Geniemon and gives it to an active one, and the Trait you pick replaces whatever occupied the slot. That is what inactive Geniemons are for, the ones you never take into battle.

A Trait's level is raised separately, through Raise. A slot can also be locked so it is not overwritten by mistake, and the Trait Compendium does this automatically for the Traits you mark.