Context about the set

So the 2-4 piece set on this isn't that impressive. Weapon damage, health, and stamina. But where this really shines is in the form of the 5 set bonus. If any enemy dies within 2 seconds of being damaged by you, you gain 5 ult. Note that it doesn't say you have to kill it(like the fighter's guild perk does), but instead, damage. Note that this is a sub-par set on dps and almost entirely useless on a majority of the bosses. But it might be the go-to sets for both speedrunning and no death runs on add heavy dungeons. Let me explain:

It's usefulness:

So as stated, this in my mind will be most useful in the hands of the tank, the healer, or both.

For tanks, any ability that snares your target usually deals damage(except for the psijic time stop ability). If a tank wears this set and dragonguard, you'll be getting warhorns like mad on your way to the boss. Yes, it's a medium armor set. But that's what the jewelry and weapon slots are for. I mean, are your dps really going to get any use out of alkosh on trash mobs? Usually not(with a few exceptions of course). Stun them, throw an aoe down, and BOOM, you have a lot more ult per sec(especially if you're also able to keep up heroic slash).

For healers, it's just a matter of putting a lightning wall. Concussed enemies take 10% more damage(assuming the dps has that champion perk). You'll be hitting all the enemies. Have a mutagen on to activate minor courage from scp and you're golden. You'll be getting warhorn a lot more which in turn will end trash fights faster.

Though when both use it, there are sections in a lot of dungeons where it can be up 100% if spaced evenly enough. Especially if you have decisive on both. Note that since the tank has a shield, he'll only get 20% and the healer will have 40% chance to get it to activate, but the tank also has minor heroism on a skill. Note that decisive also doesn't have a cooldown, so it can really rack up ult charge when getting through to the boss.

The cons

So this set is only useful for add heavy encounters. On boss battles, even if they spawn an add every now and again, makes this set complete trash. This isn't a set anyone would want to wear on a majority of the bosses ever(can't name a boss right now that has add heavy mechanics, but there might be one). This set(besides the 5 set) doesn't at all help the healer and doesn't do much for the tank. Though there is a counter arguement here:

Counter-arguement

If your team is premade and doesn't attack the boss the moment they are able to, you're able to switch to the more appropriate set. This is even more potent if you're on PC and have access to the addon "Alpha Gear" where you're able to switch to pre-set gear and abilities on the press of a button. Besides, it doesn't matter if it doesn't help with healing or tanking when used during the trip from the point A to right before the boss at point B. Most important thing is "How fast can I dispatch them and hurry ahead". This set can be immensely useful to actually supporting your team, even if it's not used for the boss area

Important to note

This is mainly only for pre-made groups. Preferably with vocal communications and knowledge of this tactic. You're not able to switch gear while in combat(though you can for skills). Doing this right, it'll make some of the dungons a Lot easier... imo