Otherspawns are first encountered on B14F. These gelatinous maidens can summon others of their kind, but seem to only do this in the first couple turns of combat. Individually, they aren't much of a threat and can be disposed by Volt attacks, but they can lower the party's ice resistance. However, if three are together in battle, they may attempt summon forth a Deep Coistrel or Deep Prelate, which will generally make your day much worse.