The Blood Mage - an OSE Class Based on Whitehack's Magic System

Whitehack’s magic system is awesome, so I wanted to hack it into OSE, which is what I’m currently playing. Here is my rough draft, any feedback before I let my players loose with it?

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Found an error:

Should be “if a 1 is rolled on this save” not a 20

Damn roll over and roll under in B/X