Empirate
First Post
While I dig your comparison, [MENTION=6705156]Marshall Gatten[/MENTION], I think an either-or solution would be preferable here. Solid Fog and Fireball are hugely tactical spells - you don't just cast them and hope for the best, you cast them in specific situations expecting specific results. Especially when both are cast in conjunction! So while a percentile roll to determine what happens seems like a decent solution from a pure rules perspective, from a gaming perspective this rule would only result in nobody ever combining the two spells. Spellcasters (PC and NPC alike) want predictable results.