It's merely an extension of life, not a continuation. This comes at the cost of wounding the Divine Soul, forcibly keeping oneself alive for a period to await the dissipating of the opponent's Magic. It's a desperate measure used only when there is no other Path available.
Yet, for Black Magic Chen, the brilliance lies not in this.
Theoretically, even if they use iron nails to extend life, their lifespan has already run out, and they cannot shield their clan members from this curse.
Thus, right from the start, the Chen Family Head spoke of the most insidious and fierce Method, which is to borrow lifespan from the next generation, using the borrowed lifespan to invite the heavens back, shielding the clan members from the curse in the process.
