Anti Debuff Altar

A Red -50% penalty to every rod stat, lure speed included, is what First Sea rods suffer in the Second Sea, and the Anti Debuff Altar (also called the Rebuff Altar) is the only place the wiki knows where it can be lifted. The shrine is hidden beneath the cliffs of The Cursed Shores, deep inside the Sinister Cavern, a name the wiki says was coined by the community and not by the game. It is tagged as removed and no longer obtainable.

The route started at a portal at -302 122 870, where you spoke with Brother Murk, the reclusive guardian who appears nowhere else in the game, and then walked the dark, winding cavern to the altar room. The ritual required three rare items, all found only in the Second Sea: Sea Leviathan, Moon Idol Sea 2 (later changed to Moon Idol and now available in the First Sea) and Mythical Cursed Thread.

Not every rod qualified. The Trident Rod, the Rod of the Depths and the Ethereal Prism Rod could be cleansed, but the No-Life Rod and the Seraphic Rod, both level rods, could not. The cleansing was done once per rod and was permanent.