Fight the 2 enemies before engaging: In the game, you should make sure to fight enemies on the ground floor first, or they will join the fight against the boss.
To stun the ogre, use a flame vent: A flame vent can stun an ogre, stopping his attacks for a brief period of time.
This is your chance to attack the ogre to reduce his health.
Your focus should be on dodging: The ogre often uses grab attacks that are unblockable. He does this to force you to dodge his other attacks.
His reach is limited, so you can easily dodge his attacks and keep your distance.
With stealth death blow, start off your battle: By starting off your battle with a stealth deathblow, you can actually bypass the first health gauge.
His gauge will recover. However, if you can escape, you'll have to deal with his second phase normally.
Notable Attacks
Lunge attack: This is the hardest attack to defend against by a chained ogre.
Step backward diagonally to dodge his reach.
Jumping Body Press: Ogre will try to flatten you with his weight.
To dodge his attack, you must step away from him.
After he does this, the ogre will be vulnerable for a short time.