For other elixirs, see Elixir.
Elixir of Revealment detail

The elixir of Revealment is a quest-only combination potion obtained by mixing a Grand defence potion with a Wintercup mushroom and a Bloodcap mushroom. It is used in The Light Within quest to obtain the Seren shard of harmony. It must be used on the currently active crystal tree. Once used, it will reveal a hidden entrance to the crystal tree roots cave. If a spare potion is made, it will be removed when the quest is completed, as will any spare mushrooms.

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