It's annoing to track the HP of main golem when the health bar constantly switching to the adds.

Make the Main golem's HP bar priorized.

Agreed, FOCUS TARGET should be a feature in this game. What this means in other MMOs is that you can keep fighting anything you want but the HP bar or your focus target is in focus the whole time.

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A very good change for Oluns due to their health based mechanics, would also be nice to have at Gyfin Underground. Maybe for Calph Elvia portal bosses too? Unsure on that one

As is, having many small mobs around a large primary target renders the Target HP Bar useless.. and when the enemies are as big as oluns or gyfins, the health bar that hovers over their head is often off screen..

..but even when you angle your camera just right so that you can see the little bar above their head, assuming you dont need to move to dodge a mechanic, even that ends up useless a good chunk of the time due to loot spam from the little minions covering it up