Source magic was mostly (only?) important in Divine Divinity w/ regard to the healing crystals, so it might be cool to incorporate those into the game somehow. Three methods I can think of off the top of my head:
1) The player could actually be responsible for finding/constructing the healing spring from DD.
2) The player could manufacture healing crystals in-combat, expending 100% of mana for an item that can fully restores health and mana to entire party & cures all status elements. (...Which might be a bit overpowered... maybe it could result in a permanent decrease of stats? I.E. if you cast it, you lose all of your mana for the battle, AND permanently lose 1 point of INT).
3) Healing stones must be found/used in certain quests, along with things like Magic Mirrors. That quest line was really cool in DD, and indicated a world of cool quests & non-combat "puzzle" style mechanics that (to my great sorrow) never materialized.
