freyar
Extradimensional Explorer
Well, the non-giant sea turtle looks a bit better than a Tiny animated object (CR 1/2), better than a dire rat (except for the disease) (CR 1/2), and only slightly worse than a formian worker (CR 1/2). If you feel it needs a boost, I think it would be entirely reasonable to give it Weapon Finesse as a bonus feat.
As for the giant one, a good comp is the adult tojanida, which has considerably better AC but less in the way of damage. I think the fortification (at least if we go with usual moderate fortification at 75% unwithdrawn) makes up a bit for the AC, just like the tojanida's imp grab and ink cloud make up a bit for the reduced damage.
As for the giant one, a good comp is the adult tojanida, which has considerably better AC but less in the way of damage. I think the fortification (at least if we go with usual moderate fortification at 75% unwithdrawn) makes up a bit for the AC, just like the tojanida's imp grab and ink cloud make up a bit for the reduced damage.