Baldur's Gate 3 Players on Honor Mode run into a frustrating glitch that can easily end the permadeath run. During the finale of Act 2, the boss fight against Ketheric Throm saw the villain randomly duplicate himself, with another version of him gaining full health after the Apostle of Myrkul takes a turn. This was a bug that plagued the game for months with no end in sight, and no record of direct causation. While some players speculate that this glitch comes from Tactician difficulty, others have recalled that the same thing is happening regardless of difficulty level.
The Honor Mode run is extremely difficult, as players only get one shot. Death is permanent, so a glitch that makes winning nearly impossible is not the best experience for players. Ketheric is a chapter ending boss for a reason, so this glitch seems to happen at a particularly unfortunate time. Fortunately, players have been able to come up with a solution to save all the progress made and not completely throw the entire run away. This is good news for anyone trying to finish an Honor Mode run.
Keter Torm glitch can ruin an hour-long Honor Mode run unfairly
Keterick is powerful, but it's not supposed to make a copy of itself
Players on Reddit have been discussing the glitch and how frustrating it has become. Although it is apparently rare, it seems that many people go through it. Redditor Charybdeshands First mentioned the two Ketericks show up to ask why exactly this was happening. Unfortunately, it seems that no one has a clear understanding of what triggers this bug. Some believe it is somehow linked to playing on Tactician difficulty or higher, although this has yet to be proven definitively. Mods also seemingly have nothing to do with triggering the glitch.
A lot of players chimed in with their own experiences, noting how the two Cattericks either ruined their Honor Mode run or made victory nearly impossible. Reddit user Aren13GamerZ He managed to win, but said that the process was extremely difficult and almost killed his entire party. They said, "It happened to me in my current gameplay as well. My second Keterik was revived by Mirkul's avatar when he [cast Call of the Damned]. I killed Miracul and then I killed Keterick again.“They keep saying a combination of 
Guardian of faith
And 
Silence
is used to distract the second cat during the fight.
While they managed to get through, the same cannot be said for every other player. As previously stated, the most frustrating thing about this glitch is that players only get one shot at an Honor Mode run. Defeating Ketheric seems easy enough, but after taking so many hits, defeating a second one feels inherently cruel and unnecessary. Another Redditor Destinova Ethereal died, they mentioned how they just deleted the whole file and started over, because they didn't want to have an unnerving continuation. However, there seems to be a fix to the glitch, although it's not seamless.
The solution is far from ideal, however Players have mentioned how they force quit and, upon reloading, there was no second twitch. This will also help players not lose their entire Honor Mode run, which is just a better experience overall. However, there were reports that this did not work for everyone, with people mentioning that the hard resets did not allow them to continue their Honor Mode game.
BG3's two Keterix glitch does not have a permanent solution
Two is not better than one
The glitch has been around for months and seems to have no fix in sight. Reddit posts from four months ago detail how the glitch affected players' gameplay and Honor Mode attempts. There has been no official announcement of a fix or acknowledgment of the bug. While the solution for now is to simply hard reset the game or unplug the device, this hardly feels like the most effective or efficient way.
For now, the best solution if a player is greeted with two Kethericks is to try a hard reset, hopefully circumventing the save file becoming unmanageable, which does not always work. And while it's not the ideal solution, it can allow players to continue their Baldur's Gate 3 Game of Honor Mode.