Defender of Light

Reward: Temple of Light Seal
Renown: 750

Talk to the Abbot in the Temple of Light, he anticipates an attack against the Temple. Return to Wellspring Cave and proceed to the spring to your left. There are lots of Shadow Worshippers here who are equipped with ranged weapons. Use your strength and will to kill them and go back.

The second spring you go to is much like the first, repeat what you did earlier and kill the enemy below the spring. When you are finished here you will be lead to another spring, this is the final one.

You'll encounter Cornelius Grimm, leader of the Shadow Worshippers. You can't inflict any damage on him immediately so focus fire at his companions. The first wave of enemies you will fight are Shadow Worshippers, kill them like before. Next you'll face off against Hollow Men, you should have plenty of experience killing these by now.

When you are done killing off Cornelius's goons he will take matters into his own hands and try to kill you himself. He isn't weak to any kind of spells in particular so rely on your strength for this one, if you slash him he should die without many problems. Congrats, you've saved the Temple of Light!