At some point, Vitiate commenced his galactic-busting ritual on Dromund Kaas but he dispatched his minions to orchestrate chaos in these worlds to fuel his galaxy-busting ritual. The entire chapter 3 of Jedi Knight story is about sabotaging Vitiate's galaxy-busting ritual.

Based on this conversation: - It is safe to assume that the Opticron droids were referring to the galaxy-busting ritual. Opticron droids and the Hands likely felt that Vitiate would orchestrate the galaxy-busting ritual (again) after his recovery. This is hinted even in a codex entry. However, Vitiate seems to have cancelled or postponed his galaxy-busting ritual after his recovery. His KoTFE story arc is in progress at present. "He may have grown more powerful" is really understating it. Vitiate became much more powerful in the aftermath: Moreover, Revan believed in the possibility of Vitiate being a planet-buster during his time. This is hinted in Star Wars: The Old Republic: Revan. Vitiate is officially stated to be an almost godlike avatar of the Dark Side during the era of Revan. ---- Raw power (and) Command of the Force collectively determine ALTER abilities of a Force-user. Vitiate spent centuries honing his talents in the Dark Side: Vitiate also fueled his raw power with extensive use of Force Drain powers for a long time:

It is an assumption. We do not know. Those droids did not mention Ziost. Neither the Hands and nor those droids make an appearance during the Ziost based story arc of Vitiate. Vitiate have come a long way since then. He have grown much more powerful and masterful in the ways of the Dark Side since the Nathema event.

Vitiate orchestrated his galaxy-busting ritual during the times of Great Galactic War (Chapter III of the Jedi Knight story arc) but agents of the Republic and Sith manage to stop him. Disruption of this ritual backfires on Vitiate and he is struck down by the Jedi Knight on Dromund Kaas. Vitiate then proceeds to Yavin IV to recuperate and recover his strength. It is possible that the Opticron droids were tasked to prepare for Vitiate's galaxy-busting ritual or some other ritual but they were struck down by the Sith Warrior. As far as I am aware, Opticron droids do not make an appearance in the Ziost based story arc of Vitiate (because of the obvious).

The so-called evidence is not definite and/or lacking. Opticron droids were not witnessed on Ziost. They may have been tasked to prepare for Vitiate's galaxy-busting ritual. Who knows? Their disclosures are open to interpretation and only the Hands could understand them (as Servant One pointed out to Sith Warrior during a conversation). If devastation of Ziost was indeed a ritualistic event, BioWare would have simply disclosed it as such in the codex entry.

Too bad! Sith Warrior destroyed the Opticron droids before the events of battle with Revan on Yavin IV.

She isn't disclosing full details.

Can you provide video evidence? I have checked a relevant video and did not find proof of your claim in it. Moreover, Sith Warrior destroys the Opticrons droids.

If people want to exclude Vitiate from the rankings, no hard feelings.

Well, I don't have an issue with this.

Vitiate is an ENTITY. Both his corporeal and non-corporeal demonstrations are valid.

Agreed. Vitiate unleashed his most potent Force Drain power after forces of the Republic and Sith attempted to stop him from from spreading chaos in the planet using electrostatic weapons and other stuff. Interestingly, Vitiate warned the protagonist about his decision to destroy the world, Vitiate stated that he is giving the protagonist a chance to live. I assume that he did this on purpose.

Here: This is the evidence? The Opticrons were referring to Vitiate's galaxy-busting ritual. Sith Warrior also experienced a vision in which he witnessed Vitiate's galaxy-busting ritual in effect, consuming living beings and destroying cosmic bodies (including stars) throughout the galaxy. See above! She did not provide any evidence. Here is official description of Ziost related event: Revan's plan was to perform a ritual on Yavin IV, with aid of arcane machines, to destroy this world and restore Vitiate to his true form so he could be struck down. However, a Strike Team stopped Revan and Vitiate demonstrated (through his actions) that he did not need any ritual to restore himself. Vitiate then proceeded to Ziost and consumed it, restoring his power. Ziost related event is a legitimate demonstration of Vitiate's ALTER abilities. It is not a ritual. Years later, we witness Vitiate in corporeal form (as Valkorion) but this is also a mask: Vitiate is an entity, he doesn't needs biological vessels to exist and influence the external environment.

Thanks for the share. Now, let us analyze the quote. The first half of the statement implies that Palpatine is unparalleled practitioner of the Dark Side in his era [no ifs and buts in this case]. The second half implies that Palpatine "may be" the most powerful Sith in galactic history. So basically, even the authors are now in doubt about promoting Palpatine as the most powerful in the galactic history among Sith. Authors were never in doubt about making a similar judgement in older sources. Now, this matter is open to debate. Valkorion is (not) a Sith. He pretended to be one for a long time but his true-self eventually came to light. He is an entity and officially promoted as such in the latest SWTOR content. I doubt that this book covers the entire history of Valkorion and entire SWTOR content. I will provide a detailed comparison of both in some days. If you (and/or anybody else) wants to share some content with me (via PM), you (and/or anybody else) is welcome to do so. Any input is welcome.

Signed.