I didn't even know he had a server, and if its a patreon thing then that doesn't really help anyone outside of the patreon, either way ive looked everywhere and never found a tavern of spear server link or mention
Viewing post in it has been 88 days since v30 was put on the patreon
it's literally in the game's page on here, in the "about" on patreon and "about" in the game's main menu, accessible to anyone. i did leave some invite links to other people asking for it in these last few threads too.
(There are a few channels dedicated to patrons in the server, but most is public).