I liklike the feats which are activated by a roll and costs H.P . to use only if
the activation roll succeeds and the action roll succeeds. Feats occupy slots in inventory , so there is some limit to how many you can have at a given time. however you can use all of those equiped in the same round with a successful activation roll for each.
Also the feats have adjustments which cost
more hit points, but are more powerful.
It also gives a more tactical flavor to the game.