Quote Originally Posted by Dracosavarian View Post
A variable duration of Nullification being up ranging from 2 to 14 seconds of total uptime,
You're way too hung up on duration. The correct metric here in a dungeon-pull context is damage prevented.

A shield provides 100% mitigation until it's broken. In a situation where incoming damage is constant and uniformly distributed, a shield that lasts 3 seconds is equivalent to 9.375 seconds of 32% mitigation (Holy Sheltron gives you 4 seconds of 32% mitigation), or 15 seconds of 20% mitigation (The final 4 seconds of Holy Sheltron). The damage prevented, despite an 8 second duration compared to 3, averages out to only 2.08 seconds of a shield.

At that point, if you're comparing the two skills directly, you're weighing up Holy Sheltron's 1000-potency heal and a "sometimes you'll have it" possibility of banking an extra 50 Oath Gauge versus TBN's 1/3rd greater direct damage reduction and a lower cooldown that (over time) trends toward getting 50% more casts than you get out of Sheltron.

There are other use cases where you'd start looking at different metrics (singletarget raid bosses have very different considerations than dungeon pulls, obviously, dungeon bosses are different from dungeon pulls in a way that disfavours TBN, etc) but in dungeon pulls TBN tends to be slightly ahead of Holy Sheltron most of the time, occasionally very slightly behind, and generally beats out Heart of Corundum in any realistic scenario. The idea that DPS is sacrificed to use extra casts of TBN is not relevant for dungeon pulls, for example, even though that may be a concern in a raid environment.