Item description:

Load save 'Davidthegod' and run through the fog
to begin the fight.

This boss is immune to every weapon you have.
However, in his room you will see a glowing item.
Pick it up and equip this weapon, its called
'STORM RULER'

Make it 2 handed by pressing the TRIANGLE button.

Run away from him and charge your strike by
pressing L2.
Once fully charged, press R1 which will release a
force of power to strike the giant.

You will have to do this at least 3 times during
the fight before he eventually dies.

Stats are maxed so it shouldn't be a problem.