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(editing and finding better words to phrase it)
To get a spirit to team up, forming a contract with that particular spirit is a requirement.
The ProcessEdit1) Contract Ritual
—— Oh Noble Spirit sealed within this ancient, holy sword! Form a contract with me, and recognize me as thine Master! In turn, I will be thine scabbard! I command thee, form a contract with me!
2) Contract Vow
"—Thrice I Command Thee, Exchange Vows With Me!"