Probably because under normal circumstances my magic is way too powerful for here. Trapping me in a place like this can't be done unless you seal some of my powers. After all limitless doesn't mean all powerful.

[That said, the whole thing bothers him. A magic gem called soul gem that becomes dull as one uses magic and needs grief seeds to be replenished.]

Why do you need something called "grief seeds" to replenish it? Does your magic born from the power of grieving?