Raid boss Question?

Hi all, quick question. I say the raid boss in the elven ruins and decided to attack, after about 10 min of exchaning hits I decided to take off because his health had not move at all. I was not sure if it doesnt chow or he realy has that much health?

You'll need a party to have enough damage to take out a raid boss.
They have a lot of hp, and they regenerate it quickly.