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Discussion of the Conclave event (Maklak vs. Yudhishthira) and the promo with it here.
We don't typically give out info like this, but as we don't normally tie promos to events, I'll tell you this is, in terms of average credit value received per credit spent, probably the most rewarding promo we've ever run. If you value the artefacts in the promo at their 'list' value, it's a bit more than double as rewarding as most promos, and the fallback, which is redeeming the pieces for credits, is still a bit more rewarding than most promos. Disclaimer is that it's random so those are averages, of course! Might be more, might be less.
(And that's without taking into account the bonus pieces you get at 500, 1000, 1500 credits, etc.)