Verified for patch 16.8.1

Hold the Line

Allies in your back 2 rows gain 10% Ability Power and 9% Attack Damage for each ally that starts combat in your front row.

Effects

AD: 0.09
AP: 10

Hold the Line scales with

Ability Power On the Menu

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