I finished creating your request here. Would you mind checking if it fits your demand or not?
Here is a list of things I changed on my own due to inevitable circumstances:
I use Huntress' missile model instead of an arrow one due to the fact that AlienAtSystem's formulae doesn't support proper facing.
I use Geries' Hashtable Dynamic Indexing (private teaching) to index the spell. It is not as fast as arrays but it should suffice. I haven't learned about array indexing yet
I recycled a spell of my own to do this so don't be taken aback by the strange description. Just go with it
The arc is a bit erratic. It is probably due to the formulae but from my observation it is still really beautiful. Mag is trying to help me find a better formula so be patient
The spell is MUI and everything is customizable. Don't forget to credit AlienAtSystem for his formulae
Oh and can I upload this to the resource section later?