Jes's Multipots

The Merger takes two potions placed in its input slots and produces a single output. Blaze powder is needed as the catalyst, and the kind of the top potion decides how the result behaves: a splash potion on top gives a splash potion as output, whichever kind sits underneath. Potions with effects from both sources carry them into the combined result. A new tool called the Claved Retort lets a player inject the effects of a potion directly into mobs, or extract effects from them. Depending on the settings, the Retort needs glass bottles and water, and the item can be injected from the offhand. Including items gives effect, so the Retort is not limited to potions alone.

The output is capped. A setting limits how many effects a merged potion can hold and how strong they can be, with a default of 3 levels and 3 effects; anything above that limit is turned into coal. The mod runs on NeoForge 1.21.1 only and needs to be installed on both the client and the server, since its block entity and items are synced between them. The source code is public under the BSD 2-Clause License, which makes the mod open source. Files were first published on 2026-07-07, and the latest NeoForge file is 1.1.1 for 1.21.1, dated 2026-07-10.