FireLance
Legend
I don't think an extra at-will for a feat would be mechanically unbalanced. After all, the additional value of an extra at-will power is the difference between it and the next best thing that the character can do with his standard action. Depending on the situation, this could be an encounter power, a daily power, or the next best at-will power.
Where taking an at-will power is problematic, the problem usually lies with the specific at-will power than with the idea of taking additional at-will powers in general. I would be wary of giving fighters access to righteous brand, but that's because I think righteous brand is a little overpowered itself.
The recent changes to invisibility have also made eyebite less of a concern. Unless the character succeeds at a Stealth check that beats the passive perception of all his enemies, they still know where he is.
However, although I don't think that it would be mechanically unbalanced, I think that it would take away something that was previously a distinctive quality of half-elves, in much the same way that a feat that gave a character access to a third at-will from his class would reduce the distinctiveness of humans.
Where taking an at-will power is problematic, the problem usually lies with the specific at-will power than with the idea of taking additional at-will powers in general. I would be wary of giving fighters access to righteous brand, but that's because I think righteous brand is a little overpowered itself.
The recent changes to invisibility have also made eyebite less of a concern. Unless the character succeeds at a Stealth check that beats the passive perception of all his enemies, they still know where he is.
However, although I don't think that it would be mechanically unbalanced, I think that it would take away something that was previously a distinctive quality of half-elves, in much the same way that a feat that gave a character access to a third at-will from his class would reduce the distinctiveness of humans.