I am of course referring to those chests that are on the magma stones and the item right below the stairs when you enter the Iron Keep area. I have tried using Flash Sweat Pyromancy combined with Fire resistance items, Lifegems and getting wet with the vases that contain water in order to survive, but I always seem to lose life too fast. Is there any effective way to reach those chests?
As you enter the front door guarded by two Alonne Knights after the bridge, immediately head right and then left, up a set of stairs. Another Alonne Knight will be there, kill him and you will see some vases. Rolling into these vases will give you immense fire resistance. The vases, in combination with Flash Sweat and Orange Burrs and Radiant (or better!) Lifegems and as much health points as you can and preferably the Smelter's Demon armour set will net you the items.