Etherion

Aetherion is a magical substance that can increase power to certain objects. Jeral wanted to use this inorder to power his Tower of Paradise and revive Zeref. The compound is also poisonous however, it seemed to have an opposite effect on a Dragon Slayer. When Natsu Dragonil ate some, he was given a huge power boost and even entered Dragon Slayer Mode. The effects later affected him as was extremely grogy for a few days.