Elite enemy design (Something like the big armour knights from SotN, a more powerful enemy)
Design a boss arena
Design a special item/relic
Good ideas. I propose:
-Design what you think Black Maria would look like.
"Black Maria" is what the scrapped "evil Maria" boss from SotN was called by the devs. If you recall, there was an audio lost inside the game's files where Maria does turn into an evil version and gets killed by Alucard, who later laments their deaths.
We never got to know what a "Black Maria" is. So here's your chance to show us!