RE: Mother Talzin ritual

In one espisode of the cartoon series MT does some sort of ritual using some Night sister aparatus and some sort of orb sphere etc. If she wasnt interupted and absorbed all the powers and energy from that ritual and thus completed it how powerful would she have become compared to for example : Yoda and Sidious etc?

I think she would have been more power than Yoda or Sidious

Agree. The whole point was to make her the strongest. So yeah, Talzin, who was already Yoda/Sidious level, would have definitely been above them had the ritual been completed.

Would be cool if it were revealed that Talzin = The Mother (of Mortis).