Yea 10 attempts, until more gates open up.
3 aboms would have a 13.5K damage per 2 sec aura going on the entire raid wouldn't it? Sounds a bit steep to heal through.
But since it's disease cleansable, maybe it's only meant to be used as need be. Like when a slime pool goes out, someone grabs a potion, cleanse off after. When gas comes out, grab a potion, cleanse off after, etc.
Or perhaps just the 1 constant abom, with brief assistance when necessary. Will have to see the spawn rate on things.