Gauntlets of Iron Will

When this defends, the next time an attack would gain

this chain link, instead it gains that much minus 1.

Temper

Rulings

From the Heavy Hitters release notes

This effect only applies while the chain link that Gauntlets of Iron Will defends on is active. Once this chain link has resolved and there’s a new active chain link, Gauntlets of Iron Will’s effect will not be able to apply anymore.
Effects that increase power are applied as events. This effect modifies that event (and thus the result of the effect) to decrease the power gained by 1.
This effect decreases only the first instance that increases power. If two or more effects would apply and increase the power of the attack at the same time, the timestamps of the effect determine which of those effects are applied first and thus affected by Gauntlets of Iron Will.
Effects that increase the of an attack by 0, are not considered effects where the attack would gain , and thus are not affected by Gauntlets of Iron Will’s effect.
Effects that set or decrease power are not affected by Gauntlets of Iron Will’s effect (e.g. -2 would not become -3).
This effect does not retroactively apply to any effects that modified the attack before the trigger ability resolves.

Keyword notes

Temper - Temper is a new keyword that exists on equipment in Crucible of War. Usually high in defense, Temper equipment presents a choice when it is down to 1{d}, of whether to defend with it one last time and see it destroyed, or save it to use for its ability.