Boots of Omnis Ward

If you've been dealt arcane damage this turn, this gets +1

.

Instant -

your hero, destroy this: Prevent the next 1 damage that would be dealt to you this turn.

Temper

Rulings

From the Omens of the Third Age release notes

Boots of Omnis Ward’s first ability generates a continuous effect that is always checking. If you’ve been dealt arcane damage this turn, this will get +1 for the remainder of the turn.
Boots of Omnis Ward’s second ability is an activated ability and when it resolves, it generates a shielding-prevention effect that prevents the next 1 damage that would be dealt to your hero this turn.
You cannot use Boots of Omnis Ward during a resolution of a card. For example, if a card says “Deal 2 arcane damage. Deal 2 arcane damage.”; you cannot take two arcane damage, and then use this ability because a card must fully resolve first before a player gains priority.
This prevents all types of damage including damage from attacks ( damage), arcane damage, and (untyped) damage. This does not prevent loss of life.

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.