However, throughout the series, no potion proved more potent than the Elixir of Life. In Solo Leveling Episode 7, we see the first glimpse of the demon castle as Sung Jin-woo battles Cerebrus, its ...

The Elixir of Life is considered to be one of the strongest items in Solo Leveling. Jin-Woo defeated 100 floors of the Demon Castle and even fought the Demon Monarch Baran's clone to craft it.