Mana Magnetism: It grants you the power to drain mana from the environment when in total sync with it.
Golem-Replication: It grants the golem the power to replicate itself after having enough mana to do so.
Billy had thought of those skills when he created the golems. While he didn't understand them, since they appeared, it confirmed that they could be obtained using his system. Either by being learned or by using the skill shop. Unfortunately, Billy didn't want to turn into a golem, so the second skill was useless. As for the first one…
"I will have to watch the golems for a while to see how that works," Billy thought. "That will certainly add to my knowledge of mana, and then I will take the next step with its use."