Reproduction Steps: 1. Deploy a champion. 2. Equip Lost Grimoire. 3. Gale it. 4. The knockback damage will be fully applied even though it's coming from a single source. 5. This is inconsistent as any other ability and spell in the game that goes above 10 damage will get reduced by 5...except for this apparently. @Sokolov
The ability failed to work for me today against a match vs Nep, where he galed a champ with portent against a font.