Iron Sky
Procedurally Generated
I thought Theme encounter power was weaker than class encounter power... why not give something more like Dilettant half-elf power:
-All experts get one extra at-will power from their base class, which they can use once per encounter.
Alternatively, how about a Dilettante Theme that gets a "dabbler" at-will from any class as an encounter power, just like Half-elves do? That puts it more in-line with the "slightly weaker than normal" theme encounter powers but still gives you a lot of interesting options.