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Rakshasas have more hit points than other Tier 6 units (except for Ents, of course), they deal decent damage, and Kshatriyas can seriously damage six squads! In second place are the Knights of Isabel – they deal more damage than Rakshasas with two stacks attacking simultaneously. But 100 hit points at Tier 6 is a rather sad number. Although their initiative is better.
Next are the Cave Dwellers. They lay low legions of enemies with their Killing Blades. Lords are a bit weaker. I would put Erls in third place. Double damage is quite something. They also have good hit points and defense. But their initiative is weak, and Rakshasas and Knights deal more damage.
In fourth place are... Ents. Weak damage, and their initiative... It's as if they spend one and a half turns pulling their roots out of the ground. But their hit points, combined with their Entangling, compensate for these shortcomings. Shadow Lords are also in this category – a good ranged attacker who fights well in melee and can cast some spells.
Death Bringers. Only effective against Phoenixes. 100 hit points and weak damage.
Wyverns... Compared to Warmongers, whose rage blocks a lot of damage, Wyverns are like peasants. And they also deal weak damage. Only with Shakaruk (or whatever his name is?), Wyverns come to life and spread their wings.