Golden Time

Golden Time is one of Derpman's most prized spells, one of the few he jealously guards and often uses. He hasn't stored the methodology or the secret on the Paofolio due to its powerful nature. It allows him to access alternate universes and choose which one comes to pass.

Origin
The spell is named after the title of the song called 'Love of the Golden Hour' played by the band Saitama Switch for an anime about alchemists searching for the Ars Magnus.

He learned it by downloading a strange copy of the song from a virus-ridden russian file-sharing site. It had horrible audio quality and strange background noises which made the song mostly indecipherable. However, when synchronized and combined with a 'proper' version of the soundtrack, a series of instructions were heard in certain portions of the song, discussing a certain 'harmonization' needed to perform the spell.

As soon as he grasped the secret, his PC mysteriously crashed, and he lost the combined soundtrack file. The sketchy russian site was also taken down soon after. The original file has been lost, rendered completely corrupted and unusable.

Method
It is triggered when he plays a portion of a melody, either by singing/humming it or by using his tablet/device. He then internalizes the specific 'harmonization' technique derived from this mnemonic device. If done correctly, the spell expands Derpman's consciousness over several adjacent 'strings' of time, thus experiencing 'golden time'.

He simultaneously goes through the events of those alternate timelines as alternate selves. With this spell, he can make different decisions and see how they pan out. After experiencing each of the results, he then chooses which timeline 'comes to pass', and only the effects of that timeline occur, nothing else.

At his current skill level, he is only able to access an average of 3 alternate timelines. He says that as he grows in magical power, this number should increase.