Invisible posion is still available in pvp.
I had tested it and IT REALLY WORKED GOOD in pvp dimension.
If this posion wont get banned, This posion will make a really bad influence on pvp dimension.
So, my suggestion is:
ban Invisible posion
(Test report:
Time: GMT+8 7:41-7:44
successfully defeated: 1 player but I got hitted
Tester: DeepDarkFantasies)