Fifteen shadow tentacles touched the ball of dark mana that Mordant had dropped in to his own shadow. But the moment that they did, they all retracted. It was similar to a kid grabbing their favorite candy then realizing that their parents had said no to eating it right away.
This didn't halt Mordant's plans, he just kept walking forward a little by little with more dark mana spilling around him. He was a dark dominator dragon. He had a large amount of dark mana that any monsters with the same affinity would find amazing. So much so that even in fear, if they needed it, they might take the risk.
Which was exactly what Mordant was hoping for.
If he could bait the shadow eating octopus in to taking this dark mana, then he would have some bond with it. At the very least, that bind would be so small that it did not immediately run away from him. Therefore, he could push forward and be able to bring it away from this place.