1 - Rune circle
At each level you will meet a rune circle. It creates enemies and mobs that you need to destroy. Each level contains a certain number of laps that you must complete.
2 - Boss Name / Health points
When the Boss appears you will see his health points and his name at the top of the screen. To defeat the Boss you must drain all his vitality until this scale becomes empty.
3 - AOE / Attack area
AOE is also called attack area. This designation will warn you when an adversary uses skill with AOE instead of direct targeting. These skills are usually stronger than standard attacks and the enemy gets a stun from them. Move to a safe distance when you see the market for the attack area.