There's way to many people who do enough damage to get credit for the Ovni fate in Hydatos. And then they run away to get a good portal while leaving the boss for others to kill.

Can Ovni become one of those mobs where he doesn't die even if you take him to 0%, instead once he reaches 1 HP, he starts casting an AOE maybe slightly larger than Megastorm, and if you stand in it you get some buff called something like Aetherically Unbalanced.

And if you have this buff form Ovni's explosion + the level 60 gold rating buff, only then can you enter a portal.

Same thing should be applied to the support NM as well because there are people who run away early for that as well. I'm seen portals on the very edges of maps get instantly claimed after a support FATE has ended.

This would solve a lot of headache for people actually helping to kill the bosses so everyone can enter BA.