This post contains a lot of maths, thoerycrafting, and maintanking by someone that has had zero success with Savage drops.
So, as someone who has been trying and failing to clear Omega 3 Savage for the last two weeks, I've gotten a good feeling for the fight. And if anyone remembers my post on O1s, you'll know that the percentage based attack there can cause one of your own cooldowns to backfire on you.
But from my experience maintanking this, I felt like I had to watch out for certain mechanics, as they had a very real risk of killing me just like a tankbuster. I had a feeling in my gut that WAR needed to be a lot more careful compared with the other tanks, and so ran some theorycrafting calculations to see if it's true.
From my current gear level, and the numbers rounded off to estimates for easy calculations, this is what I find.
My health is 51000. The boss hits for 17000 on a critical auto attack. Queen's Waltz in the Library phase will deal damage equal to 50% of your maximum health.
First, for DRK and PLD, they can use their tankstance to get a natural 20% damage reduction. So:
Book: 51000*0.5 = 25500
Auto: 17000*0.8 = 13600
Book+Auto = 39100
Remaining HP: 51000 - 39100 = 11900 (23%)
Now we run it with WAR, whose tankstance doesn't increase damage reduction, instead it gives them bonus health. For me, it's roughly 61200 HP.
Book: 61200*0.5 = 30600
Auto: 17000 (hits for full damage)
Book+Auto = 47600
Remaining HP: 61200 - 47699 = 13600 (22%)
That's a very slight numerical disadvantage, but not something worth writing home about. But then I realised something... This is time that the healers often spend scrambling to get to their far tiles. She might be working in a second auto-attack.
A crit here is lethal for any tank, and extremely unlikely, so I'll just make it two auto-attacks. I've seen the damage for me under Inner Beast hit for a bit more than 10K, so that's the number I'll work with.
For PLD and DRK:
Auto: 10K
Book+2Auto: 25500 + 2*10000 = 45500
Remaining HP: 51000 - 45500 = 5500 (10.8%)
I see Auto-attacks hitting me for a bit more than 13K outside of inner beast, so that's the number I'll use.
For WAR:
Auto: 13K
Book+2Auto: 30600 + 2*13000 = 56600
Remaining HP: 61200 - 56600 = 4600 (7.5%)
That's a far more significant difference. Because the Book Drop deals damage exactly equal to 50% of max HP, the tank whose defence IS to have more HP gets hit harder. Although, I'll admit I don't recall seeing my HP dip this far, so I'm betting that the first set of calculations are the better example.
Now, all of that said, there's one more thing to throw a wrinkle into this: her queen's waltz + holy spellblade combo. The red marker is ironically easier, because it gives a defence buff against her auto-attack, but the stack markers give magic defence, meaning the cut by 50% hp on top of the stack marker damage leaves her in a very good place to kill the maintank. Not helping is that the healers are silenced until after the book drop damage hits, so any heal casts will go off after her auto-attack, assuming they didn't all go to the other side of the room.
I don't recall the damage from that off the top of my head, and I can't make sense of parsers to find it out, but I can do some theory crafting based on it being something you'd want to use cooldowns for.
WAR would use Thrill of Battle, being an immediate heal and bonus to HP. It has the odd position of being the only cooldown that's reduced effectiveness by the books, but at the same time mitigates the books. Maybe being used after would be better, but I don't like the timing, I think Hally starts closing the distance before the books hit (and remove the Out of Action debuff).
Ideally, PLD would use Sheltron to further mitigate the damage, but I'm looking at a worst case scenario where she crits her auto, so that and Bulwark are out of the picture. Rampart has a pretty swift cooldown, so in that position, I'd use that.
DRK is in a good spot. The Blackest Night gives a 20% shield, effectively 20% more HP, but without raising the damage taken from the books. Whether it bypasses or not, that's an excellent bonus, hampered only if the books adjust their damage to break the shield AND drop hp by 50% (if this happens, can a DRK tell me, please)
So:
Auto on PLD: 17000 * 0.8 * 0.8 = 10880
Book on WAR: 61200 * 1.2 * 0.5 = 36720
With that out of the way, we get the following (with War2 trading out ToB for rampart):
Book+Auto (PLD): 25500 + 10880 = 36380 (71% of health)
Book+Auto (WAR): 36720 + 17000 = 53720 (73% of health)
Book+Auto (DRK): 25500 + 13600 = 39100 (63% of health)
Book+Auto (War2): 30600 + 13600 = 44200 (72% of health)
DRK get to keep more of their health due to the shield, but it boils down to Warrior having a significantly rougher time of this fight, thanks to all the damage based off your HP.
Was there a point to all this? Not really. Did I mess up due to mixing hard numbers with vaguely remembered ones? Quite possible. Could I just use a cooldown to mitigate it and save some hassle? Yeah, probably. Should healers pay more attention to the MT during these parts? I'm not going to tell them how to do their job.
I'm just pointing out that with a slow shift towards giving bosses access to fixed percentage damage, they need to take into account how it affects WAR tanking.