Found in the New Londo Ruins, after the water level is lowered.
Giving the Very Large Ember to Andre of Astora gives him the ability to ascend a standard weapon from +10 to +11, allowing for further standard weapon reinforcement from +11 to +15 (the highest it can go).
- Taking the Very Large Ember to Rickert of Vinheim will cause him to comment on it, suggesting that the player take it to Andre of Astora.
- Taking it to Vamos or the Giant Blacksmith will cause them to comment that they don't use this ember.
- There is a very rare bug as of ver. 1.03 where the player upon entering the area where the chest is located during a NG+ run will discover that the chest has already been opened thus making it impossible for the player give the ember to Andre of Astora, essentially barring the player from upgrading his or her weapons from 11+ to 15+.