Paxus Asclepius said:
The same could be done for Disintegrate, creating a 10th level spell that deals 2d6/level, maximum of 50d6, to one creature per level within medium range.
That looks quite nice. If we can make it 2d6/level, maximum of 50d6, to one creature or (a 5x5x5ft piece of an) object per level within medium range, Fort save for half damage I think I'll choose it as one of my new Sorc spells.
For another spell I'm thinking about an improvement to the Spell Trap (a 2nd edition 9th lvl spell, that the Rod of Absorption is based on). A 10th level spell that absorbs 4d6 (average of 14) spell levels from spells and supernatural abilities with greater than personal range cast at the subject of the spell and adds the spell levels as temporary spell slots to the caster as he chooses. Duration 10min/lvl.
Another spell (cleric this time) would be an improved Holy Word/Blasphemy/Dictum/Word of Chaos that can work against any general alignment the caster chooses at the time of casting, has a greater range (60ft radius), and affects more powerful foes (instead of -10, -5, -3, -1 lvls it would affect -7, -4, -2, +-0).
Another (cleric) spell would be an improvement to the Genesis power, working the same way but without any XP or GP components.
Another (cleric) spell would be an anti-aging spell, reversing physical aging for 10 years per casting, 1 hour casting time, no expensive components.
Another spell would be the the 3,5 Miracle.