Where to find success formula for sage's Elemental Change skill?

[ragnab]

New to rAthena/RO code, for the past few hrs, I've been googling and trying to understand how it all works, searching this forum, the discord, git repo, anything else that came up on google, but so far haven't been able to find the success formula for sage's quest skill Elemental Change - maybe I just don't know what keywords to search/been looking in the wrong places? So far my guess is that when a player casts Elemental Change, it calls some kind of sc_start function? which would perhaps check for corresponding scroll, endow level, then calculate it somewhere, but I just can't seem to find it.

Edit: Forgot to mention that I'm looking for the "classic" version of the formula as according to iro wiki:

Quote

Permanently changes the element of the target monster. Of the 4 elements Fire, Water, Earth, and Wind, your sage may only learn to change to one of of them. When the skill is cast, it will use one Elemental Converter of the element you've chosen. The chance of success is based on your level of that elemental endow, as well as your DEX, INT, and Job level. With medium to high INT/DEX and high level Endows, you should have close to 100% success rates.

If someone could please point me to the right file, that would be amazing, thank you very much

Edited September 29, 2022 by ragnab