MKerwin: Mountain-Slaying Attack (HFoE) and World-Scarring Solar Glory (GotMH) are not strictly redundant, but they step on each others' toes thematically. It might be neat to make a high-essence upgrade (call it Mountain-Slaying Attack, even!) to World-Scarring Solar Glory to give it the huge-inanimate-object-destroying effect, though.
Sojko:Unconquerable Transcendence (UFoE) does the same thing as GttMH (GotMH), but without the drawbacks (and at higher prerequisites).
Sojko:World-Scarring Solar Glory can already inflict infinite damage on mountains and such, though.
MKerwin:The difference between World-Scarring Solar Glory and Mountain-Slaying Attack: With Mountain-Slaying Attack, you can inflict huge damage across an entire mountain due to the miles-wide blast zone. With World-Scarring Solar Glory you can inflict infinite damage, but only over a 'palace-sized' chunk of the mountain.