2x craft materials in swamp
Or just more craft materials in spirit swamp than normal fester swamp since you have to use elix to get in

2x drop on the Nightmare raid map
2x drop of just the crafting pieces
2x entry into raid in just one gold payment entry

2x kill count on Lich Corvis/Voriyana AP (wishful thinking because I haven't even done 500 so I'm being selfish here)

2x cracked jewel drop (not applicable to jewel elix)

And that mini event before in which bosses drop Respec scrolls