Spore Technique

Zetsu is able to plant spores in his opponents' bodies, unbeknownst to the opponents themselves (including Shinobi of Kage-level). These spores are time-delayed and, once they activate, grow into clones of White Zetsu, which absorb the target's chakra. This chakra can then be transferred to someone else, provided the white clones of Zetsu were able to make contact with the person whose chakra is to be replenished.