You can add a check for factions to account for the 'each non-hostile' clause in the spell. It should affect neutral parties, as well:
System: 5e
Game Mechanic: Crusader's Mantle
Notes: No other extensions required.Code:AURA: 30 all; Crusader's Mantle; IF: FACTION(!foe); DMG: 1d4 radiant, melee, ranged; (C)