'With this Ancestor-grade Arcane Crystal, I have the power to transform Thal'Korr!'
Liam's fists tightened, veins pulsating, drowning out the allure of the stunning woman beside him. The thumping of his heart echoed in his ears, momentarily disregarding her presence.
What was the significance of the qualitative advancement of a Spirit? It meant a higher potential for future growth, the enhancement of abilities, the possibility of acquiring new powers, and even direct benefits to the master's physical strength.
The more powerful the Spirit, the more powerful the abilities under the control of the Spirit Master. Masters of more advanced realms, for example, didn't need to use their precious Spirits against beings weaker than themselves. They could often fight for themselves and assert their dominance without showing their Spirits.
Creation is hard, cheer me up!