Table: Variable Spellcasting System

The premise: Each time a spell is cast, roll on the table below to gauge its efficacy.

Variable Spellcasting System

Roll 1d12

The spell is cast successfully...

1. If the caster makes an oath never to cast it again.
2. But the caster lapses into a state of suspended animation for 1d30 days.
3. But the caster will be unable to use magic for 24 hours.
4. But requires the promise of a favor to a higher power.
5. But the caster's current health is diminished by 50%.
6. But requires a sacrifice of material value.
7. But is forgotten and may be rememorized later.*
8. And with panache, raising the morale of allies whilst lowering that of foes.
9. And is increased in potency.
10. And is doubled in efficacy with regard to range, duration, or area of effect.
11. And is tripled in efficacy with regard to range, duration, or area of effect.
12. And is retained in memory for future casting.**

Note that this system assumes the use of a "Vancian" magic system in which spells are considered to be successfully cast unless countered or disrupted. Magic systems that require skill rolls for spellcasting may use the table above if a spell is successfully cast.

* Alternatively: But the casting time is doubled.
** Alternatively: And the casting time is halved, permitting another action.