It would be cool if ashe's e could deal damage and slow targets.
I had no idea what Dawngate was, who Fenmore was before this post. the similarities are, rips out souls (even then the function of the souls are different), e goes out and returns, ult does aoe around them.
Other than that they seem quite different.
Swain's passive deals with souls like Fenmore's W, but it gives swain health, not a shield.
Don't know how Swain's Q is similar to anything Fenmore does.
Swain's w is an aoe damage and slow with a long range, quite useful and if you learn how to use it in swain's combo, even more useful, saying that this ability is useless is just odd. Again, another ability that I don't see any similarities to anything Fenmore does.
Swain's e is similar to Fenmore's e. Probably got inspiration from it maybe, but they serve different function all together. Swain roots and Fenmore gets health back if he catches the wolf.
The ults are similar, but Swain's new ult is similar to his old one anyway. If anything Fenmore took inspiration from Swain's old ult as Swain came out years before Fenmore.
Verdict: Some inspiration may or may not have been taken, but they seem to play vastly different and theme of the characters seem vastly different
Although similarities are there it's not anywhere close enough to be called a rip off.