My eAthena bugged Mjolnir:
@item2 1530 1 10 10 10 4305 4305 4305 4305
that is a +10 Quad TG "Broken" Mjolnir.
But you cannot repair it, and you can equip it.
You can also de-card it.
To make it look normal:
@item2 1530 1 10 10 0 4305 4305 4305 4305
To leave a slot open or to just not add an extra card, replace a card id with a 0
@item2 1530 1 10 10 0 4305 4305 0 0