The Three-Heads Six-Arms True Immortal Technique is nourished by blood essence primality. As the heads and arms grow, the cultivator's soul also adjusts to accommodate the newly grown limbs. Otherwise, the two newly grown heads and four arms would be nothing more than dead flesh, merely an encumbrance and utterly useless. In other words, once Shen Mo cultivates his three heads and six arms, if he were to be killed by a powerful enemy and his soul captured, his manifested soul would also be in the three-headed, six-armed form.