Stygian Dancer IIIs from The Black Galleon have 600 HP.
Stygian Dancer IIIs from The Den have 780 HP.
Hyrkanian Fighter Is from up north wreak Hyrkanian Fighter IIs from down south.
My point is, thrall tiers in these cases are meaningless. I propose stronger thralls always being of a higher tier, otherwise, what’s the point? Instead of there being only 4 tiers, simply make them go up to 8, 9 or whatever is needed.