Although the puppet would lack rules that normal core formation realm cultivators had, making their strength quite limited, and also the spiritual qi their core could store wouldn't be refilled with their own effort, the puppet would still be able to hold a core formation realm for a long time.
If their numbers were enough, they could even kill a core formation realm cultivator given that the realm of the cultivator couldn't exceed them by a single stage.
"If I deepened my understanding of puppet creation by using a couple of medallions of forceful upgrade, I might be able to comprehend how to fuse my rules toward the core of the puppet, making my creation strength and capabilities increase drastically in the process.
"Unfortunately... "
Thinking of it deeply, Leo eventually shook his head, throwing those thoughts behind his back as he stared at his stabilizing foundation in regret.