Sacrifice.

Hint 1 of 5:

The Maiden.

Hint 2 of 5:

From Andromedia's hair comb.

Hint 3 of 5:

I don't want to give this one away too fast.

Hint 4 of 5:

Have you found the orb yet?

Hint 5 of 5:

Have you figured out what is going on inside the orb?