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I just got the Royal Thorns and i LOVE them!
Initially they were just 4, but with some sacrifice help I now have 18
They have good hp and decent dmg, but the best thing is, that every 3rd turn or so, they can summon a huge stack of trash mob thorns! Like 4-500!
And enemies seem to switch to target summoned units instantly when I summon them. Also the summoned stack does decent dmg and is 100% expendable

It seems random wether you get thorn hunters or warriors though
Edit: I actually also like catapults, their aoe fire dmg skill is usefull, and them doing 200% dmg against gremling towers made me actually able to upgrade a couple of hard artifacts

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