[Edi]

#magicskill 5 1 is the culprit. It assigns one level of astral.

You also need to use #secondshape 2002 on the first monster and #firstshape 2001 on the second or your oni will die permanently after the battle if reduced to spirit form.

I suggest taking a closer read through the modding manual and asking in the modding subforum here or on the Desura forum.