Mystralian Elixir

You'll find it inside a big chest behind the Sky Shard Door in The Rise. It increases her maximum health and maximum mana permanently.

Obtaining After coming to the Rise, following the road to the left over the bridge, there is a strange door on the right side. It shows a dragonlinke picture on it with an blue crest. In the later game Zia gets a sky shard which can be used to open up that door and get the chest behind it. After defeating the end boss in the Black Tower, go back to Haven and down to the observation tech (Emilie shouldn't stand there anymore). Take the Sky Shard out of the tech and go back to the Sky Shard Door in the Rise. Now it is possible to open it with the Shard.