Dalamar said:
Since the new Mind's Eye is here, and it has the PrC that fits Syld perfectly, would you allow me to change Master Dorje feat (which I haven't used) to Augment Construction (which would've been used a couple of times, meaning that I'm losing in the trade)?
This would then allow me to get to the PrC at the earliest possible level.
Hmm... sorry I didn't get to you sooner, been working, and my spam filter for my email is filtering out messages concerning new posts out here, so I have to check it manually and I sometimes don't get to it.
As for your question... this is one of the problems with new material - incorporating it into an already-existing campaign and, more specifically, pre-existing characters...
I am aware that you haven't used the Master Dorje feat, and that it has not even yet been mentioned. I am also aware that the feat would most definitely fit into your character concept, as Syld seems very astral construct-centric...
Okay, because you asked so nicely

...
The information in this month's Mind Eye is accepted into the campaign. Dalamar - this feat change is accepted. You can edit Syld's character sheet accordingly, ASAP.
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If new material comes out, and someone is interested in using something, propose a trade of abilities, skills, feats, or whatever, and I'll look it over and decide if it's okay or not. In most cases, it will probably be accepted, although I won't say that as a blanket statement because there may be an exception, eventually.
You should probably trade an eye for an eye in these cases - if you want to use a new power, then you trade in a power for the new one; if you want a new feat, then you trade in a feat. Other trades will probably not be accepted (again, won't use a general statement because there might be an eventual exception).