Kartikeya carries the sacred Vel (spear), given to him by Goddess Parvati, which represents an intellect that is sharp, broad, and deep.
Skanda Purana & Tiruppugazh by Arunagirinathar
Using the Vel to vanquish the demon Surapadman, transforming the enemy's ego into a peacock (his vehicle) and a rooster (his battle flag), demonstrating transformation rather than mere destruction.