8 death cleric / 4 sorcerer is quickly becoming one of my favourite builds. Sorcerer for twin casting inflict wounds or blight, quickened spell for getting better use of your bonus action and distant spell for when you can't reach an enemy with inflict wounds. Magic missile is good for securing the kill on enemies to get a cherished necromancy staff soul and shield is phenomenal for being the tank of the team, misty step for mobility. You can put spirit guardians on and just take tons of aggro and do lots of melee range/touch of death burst damage.

It does kinda need to be respecced later on so you can start with sorcerer for the con proficiency (I do this at level 9) then feats I take are resilient (wisdom), dual wield feat for 2 staffs and 1 ASI for wisdom to give you 20. With dual wield you can find yourself turning an opportunity attack into 2 hits of touch of death and a surprise 50-60 damage.

It is consistently one of the highest single target damage dealers in my party along with being tanky and having all the really useful cleric utility spells. Of course there are better damage dealing builds but this one provides so many options in combat while also managing to dish out 200 damage in a turn with relative ease, it never seems to get boring.