[quote=Corporal Lance]
A Bag of Holding could be related to shadow magic. 'Specially with the Twili's little "Dimension Door" turn into pixels and teleport power thingy. Besides, Mila doesn't know that. All he told her was that he can do enchantments.
[/quote]

I called it 'Dark Travel'. There's no indication in the games that Dark Travel can link between dimensions, only places in the same dimension. I also limited my Twili's use of Dark Travel to only when he is in his natural, full-bodied form, which is near-impossible in the World of Light. That's just me, though.