Here is how I did that on my server.
Got 2 differents factions on a zone, fayries and dark fayries.
Final event in zone : The 2 big fairy bosses fight each other, and you help one.
Here's the mechanics.
Both mobs are HAB (non aggro, immune magic and melee)
They have a cycle of doanim to simulate fighting.
Around them there is fairies and dark fairies, also simulating attack, but regular mobs (non HAB)
Since you choosed a camp, you have 1 faction kos, other ally.
The small fayries kos attack you.
On death they send a signal to their boss making her depop and spawn a same model with same name, with runspeed 0.
You can now attack it, and other is still immune to attacks. simulating they still fight, but you are apart of it, and mob won't KS you.
You can probably do it more simple. but I am pretty new to this. anyway, it works.
So you could adapt this way to your quest. with signal sent to the mob you want to protect, losing a set amount of HP per let's say 10 secs.
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