Intercepting Stones

This quest is given by Spearhead in the Tenebrous Jungle after you complete the Sunwalker and Stones quest.

He asks you to investigate the ten pillars they are at:

84, 57, -12 101, 57, -9 119, 57, 0 136, 57, -2 127, 57, -8 128, 57, 3 114, 57, 3 109, 57, 4 100, 57, 4 92, 57, -2

After this you must kill 6 storm cells, up above the waterfall.

Next up is to found four sacred stones at the bottom of the pond (-12, -134) where the storm cells populate. Picking these up will spawn The Creature of the Black Pond, a level 57-58 heroic ^^ mob.

You do not need to kill him, simply to return to Spearhead for your reward. This also opens up the Mysterious Stones quest.