Well for the crowns you get Master's circle which is an accessory which gives 100%
resistance to all elements and +30def, i think it does something else but ill leave that
for someone else to answer,
As for all 250 nobody sigils im unsure, I have reason to believe its a Gear though, (Ive
only got 234 so far)

Hope this helps

-Thyphix-

i got the masters circle already i want to know what do you get from the challenges

you get an ultima panel that links to your weapon. and it's 255 sigil.