Supreme magic potion

The supreme magic potion is a six-dose combination potion that can be made at level 93 Herblore after buying the recipe for 500,000 coins from Lady Meilyr (you do not need to find this recipe in Daemonheim). It is made by combining a super magic potion (4) and an extreme magic (4) in a crystal flask, giving 316.9 experience.

A dose of supreme magic boosts Magic by 16% of your Magic level, plus 4, rounded down; this provides an additional 2 levels over extreme magic at level 99 for a final level of 118.