Don't read too far into my last post. I'm not really that heavily disappointed.
Good.
As far as I know, Force dragons are immune to force. That's it.
Well... Void Incarnates are also, but that's another epic level threat that you guys shouldn't have to worry about. Other than that, it would just be things inside AMFs, which of course opens up a whole other can of worms.
How does Umbral Awn work in regards to enchanting it with more effects? It's kind of weird, since it gets enchantments on its own. Right now it counts as a magic Ghost Touch dagger. So I guess I could theoretically Wish to put another +1 ability on it?
Yeah, that's fine. I think it is a bit weak considering the penalties you get from using it. In fact... maybe we should just get rid of the penalties on Legacy Weapons entirely...
...Do two Eager weapons stack with each other?
No. Same source.
You can have more than two weapons of course, and you don't have to attune them (and they won't take up one of your 8 item slots) as long as they're only "use activated" and not "continuous". So you could have an Eager/Warning weapon attuned, use that to determine your initiative, and then drop it and draw something else to attack with after you've started your turn. Or get some Eager/Warning armor spikes or something. Of course, this weapon will take up an item slot if you want to benefit from the Initiative boost.
Edit: Wait. Umbral Awn also gets +1d6 sneak attack dice, which IIRC is the equivalent of a +1 or +2 ability itself, isn't it?