This is starting to look like another Szarëgg. Though the Hydra does exist in the mythos, none of this information lines up with Henry Kuttner's description. The edit history didn't turn up much much this time but it does suggest that Kevin Moses was the first to use the name Szolethir on 05:32, 15 May 2017. Google only turned up two other uses of d the second paragraph about Szolethir: one in Italian on 21/7/2017, 10:13 and a second on a mythos roleplaying forum on 7/2/2018 (though the latter doesn't link it to Hydra). Another odd thing to note is that Kevin Moses only made 2 pages and both were suggested for deletion by 184.108.40.206.