They do exist ;)

They do.

Any oasis can be lv10

crop is just the most popular and easier to find/get.

No clue.. I stole them lol. Lvl 10 crop oasis are rare and most ppl have never seen one so just showing them off since you need 2 to complete a task

2? i thought 3 :0 well anways: you need 1k cats

i thought someone said you needed 4k cats?

Does attaining 3 (or 2) complete a hidden Task or an Achievement?

apparently, so. or atleast thats what viper said.

I realize it completes one of them, but which one?

the elite oasis (invader) achievement

Well there have been atleast 3 threads on lvl 10 oases, so they better exist >.<

one of the previous threads even had a screen shot of the oasis'

Are level 10 Forts as rare? Because there is one right next to the rank 1 player on my server (8 spaces away from me ).