It only takes 6 average players to kill with 6, just need to know what you're doing. 6 Blms is more than enough but if you want to play it safe have them move out of AoE range when it flies and only come in with fresh stoneskin to nuke it down. All the support can be out of range also if you have enough fire resist.
Rdm with carol/barfira and 20k worth of barfire gear will easily resist most of its attacks, takes well under 250 fire resist to cap out iirc.
I think it has around 50k hp but may be off with that, it has no regen though and doesn't resist nukes heavily.
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