Banner of Radiance

Purple Dragon Knights / Banneret's have harnessed the ancient powers of crafting and wielding unique banners, that empower allies and scorch fear into the hearts of enemies. 

Banner of Radiance -

Creates bright light in 15ft radius, all undead within the circle make a CON save throw and take 1d6 damage on a fail. Any undead in the zone take an extra 1d6 radiant damage on being hit (Incr 1 dice at Martial Archetype level up eg 2d6 at level 7, 3d6 at level 10 etc)