It would be of the total, So if you have 10 Str, and use an ability that deals 200% Str dmg, then the "damage" is 20, which is increased by the +50% to damage to the final 30 damage total.
thanks, btw i really love this new update, now there's more to strats to explore
Im very glad to hear that, ive always hoped to provide interesting choices at the very least :D