Ask and you shall receive
The Descendant Rebirth spell is in my Legacy domain. As for the other spell, I couldn't find my notes on it, so this is from the top of my head...
Squaring the Circle (9th level)
For years, mathematicians believed it was impossible to construct a square of equal area to a given circle because of limited tools - the compass and ruler could not do it. Until the wizard Barnabus discovered a new tool, a spell which became the great equalizer of not only matter, but also space and time. The spell eventually developed into its present form, allowing the caster to alter one natural law for up to 1 day/caster level. The power of this spell is similar to a
wish, save that it must involve two things being made similar, and it applies to everone/everything on the same plane as the caster. Essentially, it adds a new customized trait to the plane. However, casting the spell is very dangerous, as it requires incredible intellect to keep track of all the possible permutations and unexpected results of casting. The caster must make a DC 20 Intelligence check. If they fail by 5 or more, the spell has an additional unanticipated effect which may be detrimental to the caster.
Here are some notorious uses of the spell made throughout history:
Amirtys, keeper of the Golden Seal, cast the spell to make all water have the same density as air. River that were once waterfalls instead flowed straight through the sky. Rain stopped falling, and instead watery clouds drifted through the atmosphere. Though ocean life was devasted as fish fell to the ocean floor, it allowed Amirtys to dive/fall to depths over 10,000 feet and recover a celestial meteorite which held the cure to a great plague.
Barnabus's apprentice Moglee, upon mastering the spell wanted to see if a square peg could actually fit into a round hole. The result, which took three powerful wizards to undo, became known as Moglee's debacle. When Moglee cast the spell, holes everywhere became at once circular and square. A rash of break-ins followed as thieves took advantage of the changes made to locks. The rampaging tyrant dragon Unixthictl managed to squeeze out of the hole it had been digging in its adamant prison. There was a rash of wagons falling apart as the holes became too loose, and several wooden cabins collapsed.