Aether is just energy that can be made into matter. It is but abundent but also finite so it can run out (to the great detrament to all living things).

While some Aetheric Constructs are used for evil Aether it's self is Nutral. You can't actually assign a primeval force to the morality scale.

As for the Crystal Tower Entities, Chimeric Beasts were kept in stasis, void sent can be summoned spontaniouly, automatons are undying Machines, and Dragons are nearly immortal.

Xande, the Ninjas, and The grey skies Mobs were clones, Amon, Scylla, and "Mr. Hulk" we're generically modified and put in stasis when the tower was sealed along with the other beings in the tower.

As for Primals, they are just Aetheric Constructs who's consciousness, form, and temperament are shaped by the Summoner. Not unlike an Archanist's Carbuncles.