Bill Zebub
“It’s probably Matt Mercer’s fault.”
The ideas are straying from most conceptions of "Paladin" but I still really like it.
I think that's a Leper ability in Darkest Dungeon.An ability that came to mind (I have no idea about balancing, I am all vibes):
The paladin spends a luck token, thrusts their weapon into the ground before them, and kneels in prayer.
While praying, the paladin shakes of an amount of DMG dice/spell levels equal to his level.
Maybe have a talent on level up allowing to expand it to another PC.
Honestly, Red Hook should strongly consider either a Shadowdark or Mork Borg port.I think that's a Leper ability in Darkest Dungeon.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.