Okay, I managed to properly modify it. Thanks.
I still have a problem though. I went to the objuect editor (abilities) and made a new ablility (roar). Then at buffs, I simply removed roar from "Buffs". I thought this would make the icon go as well, as the actual boost you get from roar isn't there. I've triggered a spell with roar (an active spell which gives the same effect as endurance aura, but it's not passive), using a dummy which is given endurance aura once you cast it. You're still casting roar though, soI removed the boost you get from roar, but the icon is still there.