Health Bar
The green bar to the left of the ability bar is your health bar. The numbers inside the bar correspond to your current and maximum health. The bar will turn red if your health is dangerously low. Health regenerates over time, but you can also recover health by using healing abilities.
Abilities Bar
The abilities bar consists of seven slots at the bottom of the screen for your currently equipped active abilities. These abilities are triggered by pressing keys 1 through 7 or by clicking the icons. If an ability button is grey, it cannot currently be used.
Target
Your current target's health bar is displayed to the right of your abilities bar. Active buff and debuff icons are above the health bar. States are displayed below the health bar.