Death Cleric x Swarmkeeper leveling help

Im building Magyar from a game called Brawlhalla in dnd. Magyar is a Suit of armour being possesed by a hundred dead souls which swarm out of his body when he attacks to help him move or attack. Swarmkeeper to flavout as swarmed souls and Death cleric for some Necrotic and knight stuff. Should i do a [DC5 × SK15] or [SK11 × DC9] or just straight SK20? Maybe even a Swarmkeeper × Spores druid?