[renowner]

I dunno if its really THAT much more squishy than a BK, really. It can't use guard is the only real drawback. But a tactician can fix that easily. Stalemate is pretty easy to get around generally.
Level 70 Metalaegis has: 933 health, 60 defense, 58 resistance. (54% Physical reduction, 52.2% Magical reduction) Which you get by destinying.
Level 55 Metalaegis has: 802 health, 50 defense, 48 resistance. (45% Physical Reduction, 43.2% Magical reduction.) Which you get by not destinying.

Non destiny is a good bit less tanky, but still pretty good at being tanky i'd say. Especially for a summon unit.
Either way. . .

I'd like to see the cooldown reduced, 5 turns is kinda crazy.
I would also like it to have no cooldown if you're Black Knight / Black Knight.
I Think that's fair and valid, personally.

I would also be fine with protect being buffed.