Although the cost of alteration involves reduced power, this issue was easily resolved through the magic cube synthesis.
The revised Demon Pattern Core after the fusion with the Secret Puppet has a power roughly equivalent to the original Tier 6 Demon Pattern Core.
It's not that Sunan is unwilling to fuse a higher-tier Demon Pattern Core, but this is already the limit of what the Secret Puppet can bear.
After all, a Tier 6 Demon Pattern Core requires the Spiritual Power of an Official Wizard and a physique surpassing the Tier Four Legendary level to fuse. Even Sunan now can at most only fuse a Tier 6 Demon Pattern Core.
That said, the combat power of the Secret Puppet has advanced by leaps and bounds after fusing with the Demon Pattern Core.
Even Sunan, without using Witchcraft Artifacts and Engraving Gemstones, can only barely fight it to a draw.
And that's under the condition that his Spiritual Refinement Level has increased significantly.
