Verified for patch 16.8.1

Crownguard

Combat Start: Gain a 25% max Health Shield for 8 seconds.

When the Shield expires, gain 25% Ability Power.

Recipe

Effects

AP: 20
Armor: 20
Health: 100
ShieldBonusAP: 25
ShieldDuration: 8
ShieldSize: 25

Crownguard enables

Shield On the Menu

Grants temporary HP that absorbs damage before the unit's real Health is touched.

Crownguard scales with

Ability Power On the Menu

Scales with Ability Power. Damage and effect magnitudes that read "(scales with AP)" target this mechanic.