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Legend
Another concept to potentially consider might be something a bit like a spell book. Except in the case of the Monstru-Waccan it would be sort of an 'encyclopedia'. That would be another way to partly get around the circumstantial aspect of the specificity of knowledge regarding monster types. If he has an entry for 'orc' then he can apply some specific bonuses vs orcs. It would seem to fit reasonably well with the Martial power basis and knowledge based flavor of the character's powers.
That's a great idea, and reminds me of the old Van Richten's guides from Ravenloft. I imagine it could be modelled very closely to the spellbook and work just fine. As we develop the class I'm sure ideas to customize will come up.
Also, I came up with a solution for a low-AC controller wearing only cloth or leather. It's like the avenger's "armor of faith" (?) which grants +3 AC when not in heavy armor or wearing a shield.
Monstrous Savvy: At the start of your round as a free action, gain +4 AC vs. one monster type (e.g. goblins or black dragons) while not using heavy armor or a shield. At the start of each of your rounds you may switch which monster type monstrous savvy applies to.
Btw, what did you think of the two oaths a few posts back?