Walking Dad: [sblock]
The first 2 feats, I have no problem with you taking, they are not overpowered in any ways shape or form, and they are pretty much the reason I didn't outright ban the concept of a those feats right off the bat. The other two I am sketchy on, but I have been thinking about warlocks today at work (where I do my best thinking

) and it occured to me that I don't actually mind the concept of the eldrich blast being considered a weapon for this camapaign, with a few stipulations.
First off, if you were to use your Eldrich blast itself as a weapon, I would like you to redesign it to more of a natural attack than a spell, if you get my drift. Lets see if you can get creative with it.
Second, I would need to restrict what things you could append to it. This goes towards that fourth feat you posted, Lord of All Essences [Epic]. I would allow this feat if you take your Eldrich blast as the way I suggest, but only if you don't use any invocations paired with your eldrich blast that cause any "save or" effects. Direct Damage only. If the save or is a minor effect, I may let it pass, but I will goe over your invocations you pick and see if any don't work. If I don't restrict them, you'll just be a full caster essentially, and I'm trying to shy away from that.
Dark Transient is out. I just don't like that one, sorry.
Shadowmaster will only be allowed if you flat out promise I will never see you use the shadow conjuration ability in combat against anything other than mooks.
I hope this will make you character fit better in the setting. Let me know what you think.[/sblock]