How can various states of matter be a solvent?

every night the god kathulu goes to his underwater lair to keep his trapped alien souls in place but to do so he must lower the oceans level to keep the aliens from escaping if he lets them catch to much air they will return to there original power and will escape if this was to happen then they would over throw him he could not let this happen so he had to freeze them then throw them to the bottom of the ocean he is an evil yet smart man he knows that the power they would gain from there freedom would result in the utmost demise of the earth after his conquest however he became a leader in modern medicine he developed a medicine that would cause the aliens to not want to escape and it also has a minty after taste i know this because i am this monster that trapped these souls i need to let people know my story spread the Word yo.