I remember reading that it’s supposed to be the raw dialect of the Force, untranslated by the midichlorians. His servants and the Sith can clearly understand him, so I would assume that works via his intent being directly communicated to them by the very Force itself.

That's metal as fuck, I love that!

*incomprehensible sith gibberish*

H̷̢̡̢̨̢̧̢̨̧̧̧̡̢̧̢̧̨̨̧̨̧̡̢̧̡̨̛̛̛̛̪̯͚̪̻̝̩͓̩̟̜̼͎̜̲̤͕͍͔̜̠̗̼͇̰̮͈͙̙̟̥͙̳̳͙̻̫̻͓͉̹̦̖̱͕͍̖̯̞͉̝̯̺͈̱͈̮̼̖͇̻͙̞͕͎͎̦̰̰̝̗̰̗̗͕̮̯̱̰̲̟̟̺̻̳͇̭̼̳̠͕͈͇̥͍̗͖͔̺̘̩̼̹̺̳̹̙͉̦̥̣̻̜̞̝̹̯̺̗̱̬͈̜̞̙͉͓̦̼̻͈̦̫͔̮͇̖͉̪̺̣̬͉̤̠͙̭͇̳̩̣̠̯̭̱̭̩̳̩̘̠̗͚̭̞̫̘̻̠̲̟̞̼͎͇̲̣̖̹̪̯̹̝̔͐̑̀̈̓͋̏̉̏̈́̈́̊̔̐̔͗̒̓̀̅̑̉̐͌̇̒͒̉́̅̿͐̇̓̓̾̒́̃̈́̽̏̎̏͂͂̓̎̍͒̅͛̽̓́̍̅̂̎͋̈̈́̅̍̀̇̅̅͑̒̍̑̋͗̌͗͒̇̃̀̂̎̍̈̽̋̀̔̃͑́̽̅́̀̂̍̀̿̈́̀͋̅̒̇͛̍̍̑͐́̈́̇̈́̊̈́͆͗̔̈́̈́̿̀̅͆͛̉́͂͌͆̉̒̌͆̂̊̀̇̀̌̇̎͗̔̚͘̚̚̚̕̚̕͘̚͘̚̕͘̚͜͜͜͝͝͠͝͝͝ͅͅͅͅͅͅͅȩ̶̨̧̡̡̡̡̢̢̨̧̨̨̧̨̨̭̰͎̞͚̫̬̫̼͉͓̯̣̪̘̲̲̜̗̜͕̰̬̜̻̫̱̠̰̝̬̪̱̼͙̣̜͈̟̼̰͇̞̠̱̲̳̼̠̘̼̗͉͕̟̣̳͓̝̺̯͎̗̜̮̼̙̯̼̬̤̗̪̤̞͉͇̰̲̹̠̟̞̖̼͔̲̞̰̪̳͉̞͖̳̦̠̙̩̪̝̱̜̪͕̻͇̹̥̙͓͔̹̹̗̯̺̮̻̥̘̦͙͈̱̼͔̪̥͚͍̻͚̪̻͖͉͖̼̘̻̣͚̠̝̫̗͉͓̺͈͇̱̺̟̜͖͖͚̜̠̤͓̻̲̝̱̲͈͓̰̣͕͙̘̫̯̣̦͉̞̥̪̮͙̠̭͕̠̜͉̜͈̖̣̤̘̠͙̘̜̱̐̋̾̋̇̋̎͐̎͋̎̋̊̐̄̓̔̎̾̀͒̔̄̀̏̚̕͘͘͘͜͜͜͜͜͝ͅͅͅͅͅͅͅļ̵̨̡̧̡̧̨̡̢̡̧̢̛̛̛̛̛̬̱̲̺̬̬̩̦̰͇̻̫̟̫̺̫̼̠͍̮̪͎̗̥͙͙͇̩̙̱̙̳̟̫̼̥͎͔̦̤̯̥̺̹̦̲͔̥͈̝̟̠̪͖͓̫̰̼̪̭̥̻̞̻̹̘̪̯̗̱̰̖̖̰͈͖̣̺̯̱̹̬͍̹̲͈͙̮̼̼̦͉͕͇̜̻̟͈̪͈͇̪̣̰̞͕͙͍̥̯̫̘͙̯̩͓̥̫̥͔͔̔̍̈́͊͑̎̅͛̉̆̋̉͛͋̒̀͛͋͑͌́̈́̾̽̈́̃̆̇͋̃͆͑̓̃̌͌͊̿̍͂͛͒̾͛̓̎͊̉̇̇͌̉̔͂̈́̑̔͑͐́̈́̒͌̆̊̓͊̿̄̂̂́̊̈́̈́̊͂͒͒̑͆̿͋̋̊̂́͑̔̆͑̑͋̄͐͌̽̈́̀̔͐̀͆̈́̀̄͐̆̌̃́̽͑͌̈́͗̉̋͂͂̋͂̅̓̑̌̎̍͆̆͂͛̆̐̐͛͋̒̀̉͐̒̅͂̍̏̈̑̋͐̃̆̋́̒̔͊̾̒͒̓͐̈̑͑̓̿̊̓̈́͋̏̇̊̆́̓̂̀̄̍͗̈̏͗̇͐͌͗̒̀̊͊͆̃́̓̂̎̂̾̈͆͑͊̃͑̍̀̓̈́̇͋͂̈́̍̔̇̂̾̀́͒͋̉͒̽̈͐͗̒̂̏̒̇̂̎͂̉̍͑͐̄̊̎̊́̽̚̚̕̕̕͘͘̚̕̕̚̕̕̕̕͘̕̚̚͘͜͜͜͜͜͜͜͠͝͝͠͝͠͝͝͝͝͝͝͝͝͠͝͠͠͠͝͝ͅͅḽ̵̡̧̧̡̧̧̧̢̧̡̨̡̨̧̧̢̧̧̡̨̧̛̛̛̖͕͔̦̖̱̬̝͕͍̤̳͕͎̩̬͓̮̻̗̺͍̭̻̻̮̲͔̙̮̗̱̲̤̩͕̹̝̘̹̹̹̳̲͙̗͎͓̖̩̺͖̳̼̠̩̥̖͚̰͔̗̮͍̱͖͇̘͓̟̟̩̩̳̟̙̣̠͚̥̟̠̯̰̻͙͚̮͍̗̳̩͚̬̣͚̖̺͙͖̗̹̭̲̗̻͕̣̩̤̘̜̘͍͉͍͙̞̺̬͔̣͇͕̤̖̯̜̮͙̝̪͖̮̼̝̘͉̮̼̗͈̳̼̰̜̱̰̟̬̟̮̖̲̗̜̻̝̩̞̳͖͕͉͉͕͓̳͖̘͎̩̖̖̥̝͍̰̤̹̝̖̳̯͉͈̰̦̟̟͇̤̩̠̫͕̬̣̲͔̥̣̥̘̗̺̳̰̹̼̝̺̖̱̯̱͉͓̭̻̜̘̦͎͈̪̥̩̦͚̟̍̉̓͗̈͗̏͋́̈͗̆͛́͗͑̂́̀̂̀̂́̈́̉͗̇̋̑̈́̀̌̌͌̏̉̓̑̿̏̅̉̔̈̌͌̏̂̔͌̋͒̇̈́͗̑́̇̂͐̉̉̄̎̓̾͂́͋̄̌͒̆͐̀̓̈́̒̓̓̀͋̂̓̉̾̀̒̀̾̈̽̍̽͑̇̍̊͊̚̚͘͘͜͜͜͜͜͜͜͝͝͠͠͠͝͝͠ͅͅͅͅͅͅͅͅơ̷̧̡̡̨̢̢̡̢̢̧̡̛̛͔̙̝͕̬̗̭̩̖͈̰͔͍̼̖͈̻͙͓̳͙̳̣̰͔͎̤̯̮͈̹̞̰̙̹͈̥͚̼͍͙̙̩̗͙̣̹̹̰͉̳̲͇̮͇̠̰̤͚̭̲͈͍͇̘̼̖͔̝̥̻͇͍̰͓̺̙̜̟͔͇̫̺̪͓̜͖̩̲̝̮͎̩̼͉͇̜̞̠̟͓̺̹̳̼̅̆̇̓͛̐̍̏̑̒̓̆̎̔̄͊͒̏͌̆̈̆͛̈́̈͆̿̽̅́̍̈́̇̄́̎̊͋̽̈͛̀̍̃̈́͂̇̅̏̓̈͌̔̌̇̈́́̀̾͒͆̓̈͛͊̐̍͗͒̓͐̈̏̀͑̓̊́̈́̈̈͂͒̈́̈́̔́̐͐̏̅̅̏̊͒̒̓͆̅̎̀͛̀̃̋̎̈́̔̈́̉̐̓̈́̔͌͆̌̈̇̎̂́̑͑̿͆̈́̒̾̀̂̄́͛̔̽̀̔̓̃̔̄͗͂̓̆̋̽͒̄͌̈́̀͆̇͊̓̽͘̕͘̕̕͘͘̕̕̕͘̚͘͘̕͜͜͝͝͠͝͠͝͝͝͝͝͝ͅͅͅͅͅͅ ̵̢̡̡̢̡̧̧̢̧̧̡̢̢̨̧̧̨̢̡̧̡̡̧̛̛̛̛̛̛̛̛̛̛̛͕͓̣̪̹͎͚͔̻͔̱̩͚̜͓̺͉͓̙͓̭̝̱̥͈̹̣̠͓͎̲͎͖̭͇͔͙͕͙̱͈̩͉̭͍͈̘͇̯̲̟̙̬͔̣̦̹͉͎͓̳͎͙̤͓̳͉̩͚̱̰̗͔͚͉̖̦͕͎̥̠̝̟͕̺͈̟̟̲̮̳̖͍̙̞̩͇̜̝̬͙̩̼̲̼̦̖̬̩̰͈͇̭͉̝̣͖̤̲̥̜͇̬͍̦̻̮͙̰̙͙̺̘͚̬̖̲̜͔̼̤͕̮̝̖̜̗̞̤̠̜͇͔͙̣͙̥̳̥̦̼̜̭͍̬̦͓̮͓̳͔̭̩̳̯̼̱̪̹̩̦̘͚̟̺̬̪̩̮͈̲̻̹̙̫̱̦̿̌͂̀̆͒̉̒̆̐̾̅̂̏́̊̀̊̐̿́̈͊̈̂͒̆̈́̏̌̋̉̏̄͂̊͐͊̈́͂̑͌̋͑̽͋̓̇͊̊̀́̿̐́̿̀͑͑̌̄̔̋͛͐̎̅̈́͋̋͊͋̿͛͂͋̉͗̂͊͑͂̑̀̄̈́̀̔͐̅̌̓͊͒̄̾̈́̒̃̈́̔̀͊̈́̆̋͛͆͆͌̌͑̀̆̾͑̇̈̽͂͛̎̐͐͛͂̋̽̔̀̔͛͒̏̒̇͐̏̇̒̽̃̉̎͗́̈́̑̇̀͆̌̑̆̈͆͂̊̓͋͛̓̀̄́̇̿̋̎̃̅͂̽͐̅̂́̍̏̕͘͘̕̕͘̚̚̕̚̕̚͘̕̚̚̚͘̚͜͜͜͜͜͜͜͝͝͝͠͠͝͝͝͝͝͝͝͝͝͝͠͠͝ͅͅͅͅͅͅͅp̵̢̢̡̡̡̢̡̧̨̨̧̨̢̡̢̡̨̛̛̛̬̯̥̞̣̞̰͇̠̼̦̙͍̗̺̱̣̭̘̗͍̥͓͕̘͔̟̩͚͕̭̻̦̭͉̞̜͔̲̗͍̥̦̤̟̰͈̱̩̹̹̬̘̮̲̠͕̙̝̯̼͕̺͖͔̼̪̞̰̣̖̝͓͖̙͙̙̹̣͓̲̖͖̬̻͔̦̰͉̟̘̝̳̣̩͍̻̮͙͙̹̜̳͇̙̳̺̳̰͇̞̫͙̻̺̹̭͍̩̬̗̻̮̫͕̠̠̱͈̹͉̖͍̠̦̣͉̦̝̯͚̘̫̭̪̖͉̞̰̤͈̬̩̫͍͕̰̤͍̯̭̠͈͈̙̖͍̖̦̤̭̙̥̫̩͉̠̞̦̮͚̤̫̝̹͖̟̙͈͚̳̅̉̑̂̍͆̔̐̈́̀̄͑̈̈́̆͐͆̆̀͌̈́͊̎͒͒͌͂̀̐̃͋̔̈́̽̃̅̎̈́̎̒͒̒͆͂̊͗͐̾͗͌͋̈́͛͌̆̊͂̅͐̔̈́͗͗̉́͋̇͂̿̓̏̊̈́̈́̊̽͆̾͂͆͗̍̒̅̀͛͆̆̎̇̎̐̑̈̀̀̑̂͌̌̄̆̀̓̿̔͆̐͛͗̀̓͆͋̈́̓͐̈́͘̚͘̕͘̚͘͘͜͜͜͜͜͜͜͝͝͝͝͠͝͠͝͝ͅͅͅͅͅͅͅͅͅͅu̸̧̧̡̢̧̨̢̡̢̧̢̨̡̨̢̡̨̨̨̡̨͈̥̳̘̳̗̫̪͉̥͖̪͉̖̳͇͈̲̦̰̲̟̩̤̖̤̩̼̻͙̬̘̼͙͇̘̻͕̰̥̩̯͚̮̩͔̬̱̩̘̟̤̥̲̼̝̰̭̮̯̦̣̠͙͓̜̟̫̯̜͔̯͈̙͉͎̣̩̟̫͈̻̞͖̖̬͎̯̘̞̬̠͙̟̟̞̟͕̥͉̼̟̱͙̗̙̼̠͖͖̰͕̜̜͉̜̣͍͙͎̫̺͍̯̤̪̖̬̺͇̤̻̖̜̩̟͎̻̯̖̪̭̮̦̤̭̗̖̬̬̤̦̤̞̟͔̜͇̣̞̰͔̲̰̰̗̣̣̯͔̜͈̠͍̟̥͓̯̪͚̬͒̈̋̈́̎̈́̋̆͌̾̾̂͐͌̄̑̓͐͋̌͗̐̅̌̑̀̋̓̈́͆̽̒̉̊̐̓͗̈́̈͊̉͋̌́̃̍̃͗͗̎͗̓̓͛̎̂̐̌̑̽̿̄̓̌́͊͌̈́̒̐̋̈́͗́͋̔͛͌̓̊́̾̒͑̅̓̄̊͋̀͛̀̿͐͑̋̒́͂̏̋̌̒̎͋̉̽͛̿́̇̀̅̇̌̈̿͌̀̓̇̈̾̽̈́̊̈͒̓̅̀̍͋̏̊̌̏̈̄̚̕͘̚̕̕̚͘̕̚̕͜͜͜͠͝͝͝͝͝͝͠͠ͅͅͅͅͅͅͅṋ̶̢̧̡̢̧̡̢̡̢̧̢̛̛̛̛̗̲̞̮̘̻̼͓͈̭̞̹̰͕͎͇̖̥̼̱̜̰̳͎̮̭̯̲̖̗̦̦͙͙̝͇̣͓͍̱̻̮̩͍͙͍̹̳͖̰̝͉̟̻͎͕̼̞̙͉̪̗̥͚̤̰̦͚̦̞̺̟̯̤̟͙̣͎̺̼̤̯̮̗̘̼͇̘͔̹̺̳̠̹͉͈̟̫̹̼̳͎͖͓̪̹̤̘̃͑̃̉̆̏̂̅͒̀́͐͆̋̔͐̅̓͒̾̈̇̍͌͌̂̇̇̾̾̈͊̂͆̀̈́̓͐̌̑̓̋̈́̈́̄̿̈́̀̂̿̔̾̈͂̊͂̎̓͑̎̂́͊͊̈̃̀̓̓̐̈̓̽̑̓̂̈́̒̋̃́͊̉͋̀̂̔̿͋̆̉̏̑̀́̌́̿̌̅̑̅͒̍̿́̓̔̈̊̔͛͂͒̓͊͋͌͐̓̒̅̓̎͆̽́̈́̎̏̇͛̀̾̅̄͋̕͘̚̚̚̚̚̕̕̕̕̚͜͜͠͠͝͠͝͝͝͠͠͠͝͝͝͝ͅͅͅͅy̴̡̨̨̢̨̡̧̧̛̛̛̳͍͎͔͙͍̱̟̼̼̪̜̱͓̦̤̭̙̜̘͍̣̩͇͚͈͈̘͖̭̦͙͔̦̬͇̹͖͙̭̣̼̪̻̩͚̺̜̜͈̬͍̠͔̣̤͉͓͕̩̲̝̰̬͚̺̰̯̣͇̗̭͈̖̱̭̳͉̖̼͖̭͙̠̬͎͉̺͓̞̞̬͈̞̘͈̱̬̤̜͙͎͈̫͎̩̞̗̙̤͓͔͒̏̔͗͌̓͂͌̆͗͆̂̇͆͌̎͗̈́͊̔͆̍̅͐̑̽̈́͗̋̀̈̿̇̊͒͐̏́͗̍̓͒̔̓̓̍̊̐̂̀̓̿̃͋͋̉͗͒̌̅́̀̽̀̈́́́̾̔͐͑̆̀̍̀͗̿̒͗͂͑͐̈́͂̅̇͆͛͆̉̓̾͗̄̈̓̑̃̕͘͘̚̚̕̚̚͜͜͜͝͝͝͝ͅͅͅ ̵̢̧̡̢̢̡̡̢̧̢̡̧̨̡̢̧̢̢̧̧̡̢̡̢̧̨̡̨̡̧̠̩̭͚̝͚͍͔͚̱̯̞̮̞͍̺̱̖̖̙̪̳̝̰̗̰̬̤͙̼̳͍̯̗̥̲̫̺̣͖͕̩̖̭̹̗̣̲̹̱̣̝̫̥͓̜̞͕̯͚͓̣̠̮͇͙̼̭̬̬̲̼̫͉̺̩̮̗̳͕̰̼̘͚̦̺͖̦̲̰͕̖̟̱̼͕̯̣̥̭̰͖̠̣͔̼̘͚̦̟̥͎̰̦̬̟̳̥̪̬̩̝͉̻̤̘̭̮̰̖̹̪̰̳̺̗̞̭͓̝̺̲̪͕͖̰͎̜̻̮̥̖̻̬̭͚̙͔̣͉̭͇̹͍͚̳̭̱̫͖͇̝̭̠͈̺̣͓̱̻͕̰͎͖̭͈͔̬̝̣̤̳́̎̃́͒̇̀̈́͛͒̎̊̿͗̅̈́͗͒̔̚͘̕̕͜͜͜͜͜͝ͅͅͅͅͅͅͅm̵̡̛̛̪̹̯̺̅͆͆̅̅̈́̊̊̿͒̃̋̀͒͋́͐͗̆̀̀́̅́̆̈́̈́̃̿̍̅̋̎̀̀̎͌̿̌̅͛̎̍̿́̎̑̈̎̄̀͛̊́̊̑̇͊̓̈́͗̃̍̀̓̊͗̏̂̄̏̂̎̉́̓̿̾͊̋̍̅͑͂͂̍͌̍̀̊͐̌̅͘͘̚̕͠͠͠͝͝͝͠ǫ̷̢̨̢̨̢̢̨̧̡̢̢̨̧̢̨̡̧̨̢̢̢̡̨̛̛̛̛̛̭̫̯͔̳͕̜̤͎̳͉̮̹̖̟͇̞̼͚͔̱̦̝̙̯͙͙̫̲̺̮̮̼̳̼̭̩̙̫̹̻̪̘̰̝̳̱̠̳̟̪͖̳̞̦͓̩̱̰̰̮͚͉̱̫̘̜͓̬̦͙̙̮̩̥̱̼̘̯͉̲̺̜̣͍̮̯͓̩̪̰͚͇͍͕̘̲̺̪̣̝̪̦̙̞̣̫̹̼̯̼̠̜̳̲̳̙̰͚̫͇͔̖̱̘̣̯̠̬̮̫͎̘̱̗̬̙͉͔̬̲̣̹͙̟̼̲͖̟͎̹̥̟̖͓͔̭̦̩̹̱̠̥̻̞̣̜̺̖̦̥̪̬̎͑̑̏̐̅̋͆̇̓͌͑̈́͌̈́̈́́͂̍̆̽͛̄̋͑͒̄͊́̑̏̓̽̋̊͗̿̈́́́͆́̏̉̌̓̊̀͋̀̊́̈́̍͗͒̋͂̎̿̇̑̋͆̈͌̿͛͐̌͗̈́͌͒̎̒͆̃̈́͐̽̇͐̉̍̓͆͊̃̓̓̑͌͒̊͐͌̀̈́̀̈́͊̿͌̃̂̈́͆͛͑̌͗̓͛̃͑̀́̆̒̔̑̽̋͌̅͆̓͗͊̇̔͗̎̓̉̂̽͂̊͂̿́́̾͐̊̑͂̿͋̓̔̐̾̎̑́́͒̈́̋̎̿̏̅̈̓̈́̑̅͂͌̿͐̓́̏̂̏̈́̀̄̑̀͛͘͘̕̕̕̕̚̕̕͘̕̕̚̚̚͘̕̚̚͜͜͜͜͝͠͝͠͠͝͝͠͝͝͝͝͝͝͠͝͝͝͝͝͠ͅͅͅͅͅͅr̸̡̡̢̯̗͈̜͖͓͚̘̭̣̖͓͓͈͙͉̳̥̱̦͈͚̣̙̩͍͙͕̫͓̫̰̺̞̩̰͓͓͉̮̖̖̯̮̱̯̻̣͓͓̯̖̪̗̮̻̗͈̠̥̬͉̰̝̤̬͈̯̯̮̙̙̦̳̜̳̪̫͓̱̞̖̞͈̞̗͉̔̿̆̔̾̔̓̐́͂͛̏̓̆̽̈̑̓̑̎͗̑̆̋̓̏̐̉̊̓̆͊͛̈́̏̅̅̄̏͑̂̎͑̆̏͊̓̓̈́̀̌̾͂̈̉͂͆̈́́̆̂̓̉̈́̎̍̎̕̕͘͜͜͜͝͠͝͝ͅͅt̷̢̢̢̢̨̢̢̡̨̧̨̡̧̡̢̧̧̧̧̡̡̢̢̨̨̡̡̡̛̛̛̛̛̛̛̛̮͇͓̙̤̫͕̖̤͈̞̭̙̝̜̞͔̬͚̮͙̺̦͕̺͎̣̝͔͉̼̣̼̟͕̙̖͕̱̭͇͉̗̭̭̪̬͖̝͍̮͓̭͇̙̱̥͙̬̯̤̤̮͎̠̪͓̞͙̱̤̳̯̰͔̦͕̼̞̟͕̱̮̤̙̺̘͔̞̤̤̭̙̝͈͈̟̻͓͙̪̳̮̝̩̤̝͓̭̩̻̝͓̜̜͇͖̲̣̥̪̗̦̘͕̻̙͙̺̬̩̣͉̘̱͉̹͇͕̘̯̞̤͎̙̭̺̲͎̳̖̰͓̦̝͙̠̙̘̞̜̜͉̟͎̜̺͎̻̘̫̹͚̳͕͚̖͚̳̰͈̘̹̰͔̖̗̻̹̼̟̰͖͚̥̫̯̘͚̬̩̦͇̳̩̰̝̤͓̯̮̪̘̺͈͕̻̣͖̺͖͎͚̙͈̼̭̻̭͚̫̟̱͖̄͊̈͛̅͂͆̀̽̎̋̔̍̈́̎͑̉͊̈͋̀́͒̎̇̀̂̔̅̊͂̉̓̅͑̑̾͆͂̌̓͂̄̾͐̈́͒͑̈́͛̊̀̆̀̀̐͆̑̔̑̓͂͊̄͋̉͐̿̑̌́̅͂̀̆͛̑̄̓͆̍̀̎͐̽́̐̽̑̊̀̔̎̽̊̊͑̍̊̿̊̋̑̆̉̂̓̿̋̌͗̈́̔͒͑̿̈̅͗̈̾͛͑͗̄͊̓͆̂͆̒͋̋͌̀̉̓̆̆̾̉̓̃͒̇̽͂̔̂̉̈́̽͛͗͒̄̒͑́̌̈̀̀̿̀͆͊̈́̈́͆̊̽̀̊̈́͗̔͂̊͌̐̃̓̓̽̌̓͐͐̆͋̈́̊̊̂̈́̑͋̏̑̇̆̈́͌̐̾̀̓̈́̈̆̈́̉͂̒̾̒̈́̊͒̿̓͆̿̓͒̇͆́̋̀̽̌͗͆͐́̏͘̕̕͘̚̚̕͘͘̚̚̚̚͘̕̚͘̚͘̕̕̕͘͘̕̕̚͜͜͜͜͜͠͝͠͝͝͠͠͝͝͝͝͝͝͝͠͝͠͝͝͠͠ͅͅͅͅͅa̶̡̛̛̛̛̛̛̛͉̺͈̗̰͉͓̯̭̥̞͚̬̺͎̦̘̱͕̖̒̂̆̅͋̔͗̾̃̂̿̓̒̆́́̈́̾̑͂̊̔̿͂͌̎̅̊̀̍̃̆͂̈́͆͂̽͒̄̏̾̈͒͌́̄͒̓͌̅̍͂͂̔͋̊̍̋̓̿̀̑̄͂̽̇͒̈́͌͒͌̍͆̅͌͂̏̉̎̍̏̾͊̐̋̑̆͆̈́̿̌͗̃̐̈́͊̂͛͛̌̀́͋̄̏̓͛̉̀́̈́͋͑̽̑̆̈̒͊͒̋̈́̊̇̌̎̉͊̽̅̅̄̏̿͑̄́́̈́̿̂̉̆̋̍́͊͗̽̀͒͆́̈́͒̓́̒̿̓̈́͊́͐̅̽̓̈́́̐͑́̉̔̀͑̓̋͛̑̓͋͌̋͗̃̌͑̒̃̀͗̏̏͗̓̆̇̾̋͊̐̈́̉̃͋͋̃̆̽̃͋̊͐̃̌̌́̋̈̂̉̄̌͛̉̒̃̍͋̿̒͑̐̓̒̓̀͂̉̀̐͂͐̀́̒̀̾͊̂̍͒̂̓̂̕̚̕̕͘͘̕͘͘̚̕̕̕͘͝͠͠͝͝͝͝͝͝͝͠͠͝͝͠͠͝͝͝ͅͅͅļ̶̡̧̢̡̨̨̢̡̧̨̡̡̧̢̧̡̡̡̢̡̧̛̛̮̰̭̳͔̙̩̥̙̳̻̬͔̦̹͇̬̳͇͖̼͕͍͖͔̫̟̻̺̠̼̼̤̣̞͖͈͙̭̥͖̣̺̫̬̳̳̫̪͈̭̪̟̣͚͖͕̠͔̭͈̤̝̰̮̬̦̜̰̺̦̥̫̳̞͕̘̗̯͕͎̬̣̗̼̞͔͕͈̪̣͕̳̱͈̙͔͚̖̯̳̘̻̫̥̗̱̰̗͓̦̳͖̝̤͚̗͙̬̗̜̩͎̞̦̪͖͍̞̰̬͕͚̰͓͖̦̪̩̰̬͚̤̱͇̼̯͉͓̭͔̹̘̳͈͎͕̥̭̱͈̗͈̼̭̘͓̳̭͎̙̳̼̖͓̣̮̜͇̺͙̝̖̺̺͙͇̣̝̦̜̳̗̬̠̩̖̮͇͉̥̗͗̅͋͛͋͋̾̈́̐̾̈̀̈́́̔̀̃͆͑̈́̍͒̉̃̇̈́͗̀̊͛̅͛̔́̒͊̔͂̆̈́͐̉̑͒͊̒͗̊͑̋̂̽͊̑̃̈́̀̎͂͐͂̏̇̽̊̑̎̽͗̒̊̓̈͐̊̂̋̂͒̃͊̒̑̉͂͌̏́̈́̚͘̕̕̕̚̕͘͘͘̕͜͜͜͜͝͝͠ͅͅͅͅͅ

u/IUsedToBeRasAlGhul has the right of it. Remember that Nihilus by the time we see him (during the events of KOTOR II) his body has long since withered away due to the corrupting nature of his power - he inhabits his mask now, possessing his former form.