Below, you can find the full FFXIV: A Realm Reborn item info for the Soul of the Monk item. This item is a Soul Crystal and is usually a crafting material or the product of a craft. Sometimes it can be dropped from a monster or found in a chest.

Soul of the Monk - Amulets - Items

Soul of the Monk
Soul Crystal

PGL MNK

Level: 30 		Item Level: 30

NPC: FFXIV Gil 0

Upon the surface of this multi-aspected crystal are carved the myriad deeds of monks from eras past.