Sigil would be creator, not caster as the magic comes from the device, not the user of the device. For example, a command word wand can be used by a grog with no Gift and thus no sigil. You cannot suppress your sigil as it is a part of the essential nature of a thing. "Let me add that Sigils can also be Arcane Connections, so they can be investigated, and should be a part of a magic item." Let's not confuse the physical sigil with the "mystical sigil". The physical sigil is an arcane connection. The mystical sigil is not, although it may give a clue (and sometimes quite a substantial one at that) to who cast a spell. Intellego Vim ftw. A maga's mystical sigil is always part of the items that he creates.
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