Lady Lena's pillars didn't attack randomly. She had initially focused on the dark world due to that technique's annoying properties, but she redirected her condensed tides toward the incoming offensive when she sensed it.
The pillars curved as they moved toward the dark beam, the army of spiders, and Night. The Pterodactyl was the only asset fast enough to dodge them, but Lady Lena's technique managed to slow down its advance anyway.
The spiders couldn't do anything. The workshop wasn't complete since Noah had yet to add cores to its creations, so the creatures exploded into a wave of dark matter when the pillars hit them.
The dark beam could continue to fly forward even when multiple pillars converged on its position. Still, Lady Lena soon focused on that ability and made most of her dense tide target it.