He will invade as the player crosses the bridge to the Priestess' Chamber bonfire.
He is very good at evasion and can land good hits from poking behind his shield. Guard breaks may prove useful against him. He will also throw Lloyd's Talismans frequently during the fight or if he sees the player attempting to drink from their Estus. He is also able to use his own Estus Flask, so Lloyd's Talismans may also prove useful against him.