He sounded like he was bluffing when he claimed he could take more beatings, but he wasn't bluffing about it. They believed that his capacity for Entropy was Rank(10) * Total Divinity(42) * Total Volume of Supreme Metacs(9^3), which is 306,180 units, but they were very wrong about this.
First of all, he had a Divine Spark, so his true capacity for Entropy was actually Rank(10) * Total Divinity(42) * Total Volume of Supreme Metacs(9^3) * Authority(10, which is 3,061,800 units, not 306,180 units.
Secondly, he had the Spark of Power, which was providing 693 extra divinity and 21^3 extra volume, all from the 21 cubes. So his total capacity for Entropy is Rank(10) * Total Divinity(37 + 693) * Total Volume of Supreme Metacs(9^3 + 21^3) * Authority(10), which comes to a total of 729,270,000 units.
Therefore, he was actually 2,381 times more resilient to a beating than they estimated. So he wasn't bluffing at all when he saw that the Will could continue to beat him.
