Mu You had already used the Pocket Watch to roll the rewards multiple times, discovering that besides the Experience Book and 50 fire resistance points, which are guaranteed, the remaining two types of spoils of war would vary.
The purple Sky Set will randomly drop any part, while for the Evolution Gem, Mu You initially thought that since they killed the Lord of Fire, they would definitely drop the Flame Gem. However, after rolling a few more times, they realized this was not the case. The drop could also be a Frost Gem, Thunder Gem, or gems of various other elements. The attribute of the gem would directly influence the final evolution direction of the equipment.
The variability in the loot drop only indicated that these gems did not explode directly from the Lord of Fire but were 'stock' stored in advance by the Fool's Ancestors in a certain place. Every time the Lord of Fire was killed, a random item would be thrown out as a reward.