I saw a more generic form of this idea from @Garthanos and I thought it might make an interesting house rule for healing word.Healing Word: (remove base healing). The target may spend 1 hitdice. For every level above 1st this spell is case, the target may spend an additional hitdice.
A nice way to make the spell a little more costly as it pulls from your "reserves" and puts an implicit limit on it. This contrasts with cure wounds which is "endless" magic but slower, which seems a nice differentiator between the two.
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