((It corrodes, though. It would just corrode the metal. I just use rot as a general term for his magic.))
Jason doesn't wake up.
((Then glass. Or plastic.))
((You're not getting it. Any material just does the same thing. Also, why would Angel even help Angerus cut somebody's arm off? That just seems horribly out of character. She would honestly probably scream at him not to.))
((1. Plastic and glass can't corrode because, well, they don't.
2. She's just replacing the knife he lost.))
Angel goes to her room and begins work on a special project.
First, she makes a left arm out of plastic:
[34+85+20+8-50=97]
It's not a perfect arm, but it would work.
Next, she enchants it.
[23+85+20+11-50=88]
The enchantment doesn't really take. Angel grumbles and tries again.
[40+85+20+11-50=105]
This time, Angel successfully enchants the arm. If it is attached to someone, it will function as an arm.
Angel stores this arm for when it could be needed.