Never had an Easter egg but if this is a buff that people think is worth having then you may want to have your BS to level #35.... or get it to level#15 and just wait and do L-15 to L-35 at the festival since it will be sooo much easier there.
Also both the Unknown Iron Rune Dice and the Charged Iron Rune Dice are "Bound" so perhaps you will have many Level #35 Blacksmiths too
Is there any way to tell if the buff really changes my drop rate? I'm guessing not but there are so many things that I do NOT know so perhaps...
Thanks