They usually would just make the 2 groups kill the bosses at the same time (with like 5-10 seconds of leniency). I have played multiple MMO raids with this kind of mechanic it's not as bad as it sounds.
You simply just stop dpsing at a specific hp threshold, wait for raid leader's signal then...
Honestly I dig this, bro was a scumbag but he had more character developments in 15 chapters than the mc Rent a GF ever had in whatever they're at now, 400 or something?
Honestly a story from the heroine's pov where every single one of her party's members slowly get corrupted behind her back sounds hot af, definitely would read.
Nah it actually does happen a lot, unless the game has extremely strict timegated contents you almost always get a few huge swipers that completely outgear everyone else. Gigantic day-1 guilds are also very real, mostly people from an already established community.
I kinda forgor the lores for the oni tribes, was it ever explained why their princess have human blood? Did their queen simply fell for a human or did she get, you know, r-worded, by a human during the war or something?