Title says it all. I know there are going to be a few people clutching their pearls in astonishment since it wasn't that long ago that players were saying it was going to be useless. This may be a little true for PvE, but PvP is a whole different story. I don't think people understand just how strong this Mythic is.
Let's look at it's stats for a minute:
It has 500 Magicka and Stamina recovery. This is literally on par with Wretched Vitality and it is up 24/7, no upkeep necessary. This is very strong.
1337 Weapon Damage is incredible. Let me give you an idea of how strong this is: Imagine a set existed that was like Hunding's Rage, except every set bonus gave Weapon damage (basically 129x3 + 300). That set bonus would have a total 687 Weapon Damage. This set bonus is almost equal to two if these types of sets combined. Bear in mind it only disables SET bonuses. It does not touch things like enchantments or traits.
This is all on top of a 15% damage reduction. Let me put it this way: to anyone who complained about Vampire Undeath, this is basically another Undeath with the downside being it isn't stronger at low health but with the upside being it is active at high health.
I tried to mimic a similar build focusing entirely on Weapon Damage, Recovery and some Damage Mitigation. Nothing I could come up with even came close. The closest I could get was:
Wretched Vitality: 519 Stam + Mag Recovery, 129 Damage (back bar only):
Rallying Cry: 6% Crit Chance, 1096 Magicka, 300 Weapon Damage and 1650 (~25%) Crit Resistance
Maryn Ring of Majesty: 200 Weapon Damage, 2314 (~3.5%) armor
Balorgh: 129 Damage at all times, 1 damage per ult spent, 23 Armor Pen per ult spent.
Just Because Torc doesn't have Crit or Magicka, let's pretend Rallying Cry had 129 damage per line rather than it's crit and Magicka. Let's also assume we are on the front bar.
Totals:
Damage: 1016
Recovery: 519 Mag + Stam recovery
Crit Resistance: 25% (as opposed to 15% reduced damage from everything)
The differences are fairly obvious. The Crit resistance is higher, but it only applies to Crits whereas the 15% damage reduction applies to everything, so I'd say the crit resistance falls short a bit. This setup has marginally higher recovery, but the difference is so small you won't even notice. The big difference with this setup, is the damage (even when we pretend Rallying Cry offers 3 lines of Damage).
The only way that this setup can come close to the stat density of Torc of the Ayleid King is by using Balorgh with at least 100 Ultimate, where you will have +100 Weapon Damage and 2300 Armor pen. Your raw power will be lower at this point, but the penetration will make up for it in terms of stat density. Going further will overcome Torc, but the obvious downside is that this is not up 24/7.
What I am showcasing here is that even if I pick 2 of the most stat dense armor sets in the game, plus a mythic, then pretend one of the sets gives nothing but damage, that hypothetical setup still just falls short of Torc EXCEPT when the user decides to use their ultimate. Meanwhile, Torc is up at all times on either bar. It begs the question of why use anything except Torc? Unless the answer is to use a more fun but gimmicky build that you know gimps you, there doesn't appear to be any reason to not use it.