[Corinthian]

In my opinion, Father illearth is the best (most cost effective) blood summon and he can be used either as a SC or a battlefield caster or a ritual caster. He has no limits! But also no feet.

The ice devils are the best plain SC. But only against people with cold scales and they also do not fly. Weak magic. Usually, only *I* likes these guys.

The Arch devils are excellent battlecasters and can be awesome with lots of reinvig gear + phoenix pyre + cast spells. Caster-thugs only. Rather mehh as normal thugs. Flight is also nice.

The Heliophagis are even weaker than the arch devils but they usually have great magic and can be used to summon the Demon lords without risk. They mainly exist so that nations can get F4 and D4 without already having those paths though. If you are unlucky you get the plague guy. They are also stealthy. But this rarely mater as they are not great thugs.

The four(?) Demon lords are hard to generalize about as they are all different. They are often hard to make in to SC though because of the lack of body slots. They are all supreme battle and ritual casters due to their awesome magic paths. They are the ultimate diversity vehicles and can cast all the mass demon summoning spells except the frost fiend spell, because why not. No one want to cast that spell anyhow.