So i was reading, and suddenly came across this sentence:
Can someone explain, or provide a website that is explaining this? I wasnt able to find anything talking about this function.
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Is it from the 4th episode of チェンソーマン? I initially thought this should be a typo, but since this is a popular manga and the official site has not fixed this, I have to conclude this is not a typo.
If it's not a typo, this で should be a particle to mark a condition. That is, the te-form (俺の力使って) is treated like a noun phrase or a "quote", and is marked with で.
This 使ってで is not incomprehensible because a te-form can be followed by でも, ですら, etc., (e.g., 何としてでも成功させる), but I think this 使ってで is at least nonstandard.
(I also thought this could be a dialectal version of 使ってて, but he is not a dialectal speaker.)