Doom Paladin

Doom paladins rarely call themselves that - they go by many names. Reforged, Returned, New Covenant Paladins, Oathmakers, Chained, Heralds. Whatever fits the ideological disposition of those paladins, why they agreed to bind themselves to such destructive beings. 
Indeed, Doom Paladins are a diverse bunch, who have enough autonomy to forge their own plots and schemes apart from their patrons. 
Little is known about Doom Paladins currently, other than that they are able to help make Plague Warlocks and can weaponize victims of the Rot Plague as mindless soldiers.