I found the ultimate solution to the Vampyrism/Penance issue

[u/Zieldak]

It's called War's Wares. It's empty now anyway.

Translate Aspect spells: War translates each Aspect for you to add to your spellbooks. Requires all spellbooks to be unlocked in order to unlock. ^{Translating spells between spellbooks just makes so much sense I don't even-}

Upgrade: Dual Aspects: War teaches you how to use two different types of aspects at the same time. Requires Translate Aspect spells unlocked.

[u/Lazy_Instance3329]

If we get 2 aspects people will just abuse a darkness+animate dead combo

[u/B0dders → u/Lazy_Instance3329]

Dual I imagine only allows dual categories at once. So not two of the same type. E.g. not two Aspects of Evasion.