I can't see anything on the SubetaPedia nor on the FANDOM run wiki apart from "they hang around in lakes". Apologies if this has already been asked, but the forum search is down so I can't search and see if there are older posts.

Pretty sure , besides getting a lucky zap from Euclid - One has to use a Elixir. IE; [item2=Common Swampie Elixir]

There are other elixirs of course. Check out: https://www.subetalodge.org/list_all/search/Swampie+elixir/mode/name

Fabulous subeta help site.

Bless you! Thank you for such a quick and helpful response!