A really minor visual inconsistency with vanilla thaumcraft eldricht construct which emits the particles from its head.
TA on the left, TC6 on the right

There's also an animation that plays on older versions once it goes through the second phase. Orbs start appearing around it and it starts to conduct electricity. I never seen it happen on this version though, I think it was one of those small features that didn't make it through while Thaumcraft was getting ported.

The current Eldritch Construct is mostly just the version from TC6 + some tweaks added, and one of those tweaks is fixing the eye height of the boss when the eye is visible (if you press f3+b and look for the line you will see what I mean). Unfortunately, TC hardcoded a distance offset down instead of fixing the eye height, so fixing that is a bit problematic. In the next major update (as in after the augment rework) I was planning on redoing all the bosses and entities to no longer depend on TC6's version of them, so I'll probably fix all of these things then.

Oh, thats interesting. Maybe when you are reworking the entities, you could buff the construct a bit, it is currently too easy in my opinion. The Wardens shields made it a lot more interesting of a fight (Couldn't spam the Fluxcloud focus) so maybe you could make the constructs fight also a bit more interesting.