Dynastic Diadem

Fealty tokens you control can't be destroyed by opponents' effects.

If you control 3 or more Fealty tokens, this gets +1

.

Temper

Rulings

From the Compendium of Rathe release notes

Dynastic Diadem’s first ability is a static ability that generates a continuous effect that prevents Fealty tokens you control from being destroyed by opponents’ effects. If a destroy effect an opponent controls requires them to declare a target (e.g. destroy target aura), the opponent is still able to declare and target Fealty tokens you control; however, those Fealty tokens are not destroyed when the effect resolves.
Dynastic Diadem’s second ability generates a conditional continuous effect that is always checking. If you control 3 or more Fealty tokens, Dynastic Diadem will get +1. If you control 3 Fealty tokens when this defends, then you lose one Fealty token, this will lose the +1.
If a Fealty token comes under your control during the damage step and causes the if-conditional effect to become active for controlling 3 or more tokens, it will get the +1 but the damage will not be recalculated.

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.