Probably Palpatine.
During RoS itself, Palpatine tells Kylo that he had been "every voice you have ever heard inside your head" -- and we actually saw him telepathically communing with Kylo at the end of the series:
https://i.imgur.com/jyDjG4a.jpg
This is important because just after the Temple went kablooey, we saw that same voice(Palpatine's voice) speaking to Ben:
https://i.imgur.com/OSUibFs.jpg
So logically speaking, the Temple's destruction was engineered/carried out by Palpatine as one of the final tipping points to make Ben seek out Snoke and embrace the dark side.
It definitely wasn't Kylo, imo. Not only was he legitimately shocked after the Temple had been destroyed, but he never demonstrated the ability to produce lightning at all(let alone ranged lightning on that scale.) I suppose it *may* have been Snoke, but I doubt it.
Even if it was Snoke, Sidious could still duplicate the showing considering he is more powerful. 🙂
But I think it could have also been the Knights of Ren.
Ren- "Lets go find something to burn"-
https://i.postimg.cc/7Z5vSsmG/Star-Wars-The-Rise-Of-Kylo-Ren-01-of-04-005.jpg
Cut to the temple burning-
https://i.postimg.cc/prcGTxN0/Star-Wars-The-Rise-Of-Kylo-Ren-01-of-04-007.jpg
Maybe the Knights actually blew up the Temple, and Snoke or Sidious just put the illusion of a lightning storm being the cause in Kylo's mind?
Originally posted by Sheev
Even if it was Snoke, Sidious could still duplicate the showing considering he is more powerful. 🙂But I think it could have also been the Knights of Ren.
Ren- "Lets go find something to burn"-
https://i.postimg.cc/7Z5vSsmG/Star-Wars-The-Rise-Of-Kylo-Ren-01-of-04-005.jpgCut to the temple burning-
https://i.postimg.cc/prcGTxN0/Star-Wars-The-Rise-Of-Kylo-Ren-01-of-04-007.jpgMaybe the Knights actually blew up the Temple, and Snoke or Sidious just put the illusion of a lightning storm being the cause in Kylo's mind?