Tonic

Tonic is a power skill which grants up to 100% of the player's health as blue, working as temporary health for 10 seconds. During those 10 seconds, the player is given a 20% damage reduction and full protection from the Malaise from all sources, as well as a slight speed buff.

Trivia

 * Prior to v1.1, Tonic healed using set number of health instead of percentage.
 * Prior to v1.9, Tonic was purely a healing skill which would heal a % amount of health while giving the player a shield for 3 seconds and needed a flask to be recharged. This was similar to Vampirism before it was changed in that same update.