OK. Here is prolific vegetation and prolific forestation. Its very close to the originals. The factors are legitimate - spell factors have precedent in the pestilence epic spell, and horrendous dessication is the precedent for the range per caster level. Epic spells are an art more than anything.
Prolific Vegetation
Conjuration/Metacreativity
Spellcraft DC: 64
Components: V, S
Casting Time: 1 minute
Target: One-half mile radius +300 feet per caster level
Duration: Instantaneous
Saving Throw: None
Spell Resistance: N/A
To develop: 576,000 Cp, 12 days, 23,040 XP. Seed: conjure (DC 21). Factors: enrichment effects, duration and area as per plant growth spell (ad hoc +16 DC), Rejuvenate effects as per rejuvenation spell (+21 DC), area level dependent adding 300 feet radius per caster level (+25). Mitigating factor: psionic enchantment via expenditure of epic power slot (-19 DC).
This spell causes scrubs and grasses to grow over an area that previously had no growth, per the rejuvenate spell (Dark Sun Core Rules 3.5 page 164). In an area where there is vegetation, such vegetation is enriched per the plant growth spell, and the newly created vegetation created by the rejuvenation effect is also subject to the plant growth effect.
Prolific Forestation
Conjuration/Metacreativity
Spellcraft DC: 64
Components: V, S
Casting Time: 6 minutes
Target: One-half mile radius +300 feet per caster level
Duration: Instantaneous
Saving Throw: None
Spell Resistance: N/A
To develop: 576,000 Cp, 12 days, 23,040 XP. Seed: conjure (DC 21). Factors: enrichment effects, duration and area as per plant growth spell (ad hoc +16 DC), Rejuvenate effects as per rejuvenation spell (+21 DC), change to trees (ad hoc +10 DC), area level dependent adding 300 feet radius per caster level (+25). Mitigating factors: psionic enchantment via expenditure of epic power slot (-19 DC), increase casting time by 5 minutes (-10 DC).
This spell causes trees to grow over an area that previously had no growth, per the rejuvenate spell (Dark Sun Core Rules 3.5 page 164), except the growth is trees. In an area where there already trees, those trees are enriched per the plant growth spell, and the newly created trees created by the rejuvenation effect is also subject to the plant growth effect. If there is existing vegetation, the vegetation is subject to the enrichment effects and are not replaced by trees.