Suggested changes to Mana Costs and Mana Regen

[Chance]

Ideally, if you OOM, you should be able to recharge within a reasonable timeframe instead of being indefinitely fixed at 0-20. The sweet spot for this is probably higher MP costs for spells, but a similar rate of recharge to what we have now, so you're never 'just stuck', but MP is up-and-down throughout the battle (thus giving Absorption more opportunities to work its gimmick).