I have done both of today´s Ashava World Boss with many low-level players (levels 9 to 20) and the first one Ashava had 1/4 left and the second time almost 2/4 left. There should be a minimum level of players that can join because if not, the high-level players will never make it. It should be all required level 25 or at least levels 24-25. I am pretty sure nobody has killed it because these players that join are very low-level and end up leaving because of one-hitter. Note: I am not being a levelist (level racist haha) just a realist.
I managed to get a kill on the first spawn with a bit under 2 minutes left. I think the lowest level I saw was 10. I was 19 at the time, and I saw levels all along that range and only a couple that were 25.
There were plenty of deaths and people TPing back to Kyovashad to repair, but we managed to get it.
First time had like 5% or 10% left. The second spawn we killed it incredibly fast, had tons of time left. The group seemed to lean heavily sorc though the second time.
As the players understand the mechanics better it will be less of an issue. There is definitely a sweet spot on where to stand or position yourself. Also a lot of his attacks have visual queues.
You can technically redo the people in the instance. It seems like it auto forms or takes the next available set of 8 players. When you leave the instance area you have a chance of getting another instance with a different group of players when you go back.
It’s hard to tell exactly where that is on the map (the instance line) but when I went to the left all the way to the inlet and ran back I had a new group of players. In fact it showed new players running with me in the canyon going out to the lake.
100% its all about how many people end up on your layer