After the quest is completed, if you go back to Eluned (the female elf who recharges your teleport crystal) she will teach you a new enchantment. This allows your teleport crystal to teleport you right outside the temple of light where you sang in the quest to enchant the blank teleport crystal. This is helpful for slayer, as you no longer have to have a full set of mourners to get to dark beasts.

This is already said in the Rewards section.

As this has been solved, I'll go ahead and lock this. :)

 

~Aura