Of course, that's more common, but I was dipping back into the Greek roots of original usage and bastardising it with modernistic English suffixes.
Phylactery
Phy*lac"ter*y\, n.; pl. Phylacteries. [OE. filateri, OF. filatire, filatiere, F. phylact[`e]re, L. phylacterium, Gr. ?, fr. ? a watcher, guard, ? to watch, guard. Cf. Philatory.]
1. Any charm or amulet worn as a preservative from danger or disease.
2. Any charm or amulet with powers of magic.
3. Among the primitive Christians, a case in which the relics of the dead were inclosed to prevent the escape of magical properties.