Sontalak is the easy winner on P99 because we have non-classic mechanics.
If we had 100% Classic EQ mechanics...
- Sontalak's AE would be every 12 seconds and the proc would only hit the MT. The fear would be far more easily resistable and anyone with decent resists when hit would be feared for 6 seconds or less. This fight would be doable with 30-40 P99ers.
- Tunare would not be perma-rooted. Allowing a good puller to pull her from her spawn location to the temple east of the zoneline, which then let's you corner tank her negating the challenging Knockback/root mechanic which forces tank swaps and speed bumps. Just a tank/cleric/DPS fight like most of the rest of EQ. Doable by a solid 60 P99ers with a fairly optimized CH chain, warrior list and melee DPS.
- AoW like the above, simply a check against number of clerics, warriors and melee DPS. Doable again by a solid 60 P99ers. I think AoW would be doable with around 30-40 players if you are running 10-15 Druid/Enchanter Charmers, 10ish Clerics and a few mages/shamans/Paladins to Debuff and control breaks. But the world will never know!
Given classic EQ Mechanics, I'd say AoW wins the most challenging fight. His damage output and mitigation are higher than Tunares, and in classic Velious due to her not being permarooted you could negate her ability entirely to force tank swaps or kill random DPS.
This assumes the raid mob in a vacuum. If you're talking about the environment then Tunare simply because that clear sucks. A classic NToV crawl sucks about as much though...
I'd really love to see Vulak Ring Event implemented here. Just to provide one challenging raid that doesn't get snap FTE'd. In era that's a raid that is actually tuned to a 60-70 man raid where everyone's role actually matters. Or Luclin cause hot damn there are some many great raids to pick from.