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After finishing The Crucible for the first time, Hammer will wait for you by the Westcliff docks and you're free to return to Oakfield to investigate a problem at The Temple of Light. There, the Head Abbot tells you that they're in need of a protector once more. It seems that the vile cultists from The Temple of Shadows intend to poison the holy water in the Wellspring Cave, which will in turn cause the Golden Oak to die and cause the downfall of The Temple of Light - maybe even all of Oakfield! You're to journey into the cave and protect the water "at all costs".

Enter the Wellspring Cave via the same entrance you and Hannah entered not so long ago. When you arrive in the left water chamber, you'll discover a shadow-worshipper busy performing a dark ritual. You should be able to take him out with one hit, but you'll also have to contend with a handful of highwaymen protectors in the room. Finish them off too, then backtrack to the central area and head into the right water chamber. Another robed shadow-worshipper and his highwaymen protectors await you here. Slay them, as well.

All that's left is the central water chamber. There, you'll encounter Cornelius Grim, leader of The Temple of Shadows. The vile priest has a ring of blades that surrounds him, making him invulnerable for the time being. You'll have to deal with yet another group of highwaymen and two waves of hollow men before Cornelius can be subjected to physical harm. With the blades dissipated and his minions are dead, Cornelius transforms into a shadow and charges at you. Hit him with whatever weapons or spells you prefer and he'll go down without much of a fight. Once he's defeated, a Temple of Light monk enters the chamber and thanks you for ridding Albion of a great evil. This earns you 750 renown points and the Temple of Light Seal trophy.