Regarding the heart fragment of the God of puppets, before he had gone to the Imperial City of the Abyss, Saleen might have desired it at all costs. If his Puppet World territory absorbed it, its strength would become unparalleled. It might have even surpassed his Water Element territory for a bit.
However, Jason told Saleen that only his own creation would be perfect. For a mage, the importance of a territory was self-evident. The level of perfection of a territory would determine the level of understanding of the rules that a mage possessed after advancing to level 13.
The God of puppets was definitely not above level 15. Although the energy contained within the heart fragment made Saleen's heart waver, Saleen's magic power furnace could transform any magic chords, crystals, and even elemental creatures placed inside it into pure energy.