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The ForgottenAs Juxt already pointed out in his post, undead are no regular part of Japanese mythology, but it is too hard to resist. They started as low-budget cannonfodder for Frostgrave, but I grew fond of them and upgraded them to a whole unit.
The base is old Citadel plastic skeletons (I found at the bottom of some storage box), modified with a few weapons (mostly Perry) and a few different skulls.