Target Strength

Just like normal MMORPG, the target strength for the creatures are define beside the target with a small icon.

Blue: Easy Prey
Green: Decent Challenge
Yellow: Even match
Orange: Tough
Red: Very Tough

I added some screenshots to show how is it like in-game.

Small blue indicate that it is an easy prey!

The small red shield like icon show that it is a Very Tough!!

Even though it is very tough, sometime you will be able to kill it if you are in luck!! =D