Magical Research takes 1 week per spell level and has an initial investiment cost of:This gives slightly different costs for spell research: 3rd level spells costs 2,000 GP more, 4th level spells cost 4,000 GP more, and 5th and 6th level spells cost 2,000 and 4,000 GP less, respectively.
Round to nearest 10,000 unless this would lower the cost.
- 2000 GP/level minimum,
- 5000 GP/level for spell levels 4 and 5,
- 10,000 GP/level for spell level 6.
I haven't worked out the chances of success yet. My initial thought was d20 +4, result of 20+ means success, double investment to add another +5 (triple = +10, etc.) But this violates my principle of keeping d20 rolls restricted to conflicts (attacks and saves against hostile spells)