No Exp - Works correctly, but it shows an XP gain is incoming on my XP bar when mouse over occurs.
Just ignore it, plants have no XP, easy to learn.
Mana Burn - I did not get afflicted with Mana Burn (I was a Thief, Taurog Worshipper, with a useless Viper Ward).
True, there seems to be a poison resistance and mana burn resistance here and there for no reason, some people already said that.
First Strike - I assume this applies the Mana Burn, but it's confusing when no Mana Burn takes place.
That's the point, I guess, and it provides a nice little exploit where when you're worshipping Tikki Tooki with a Rogue or you can otherwise dodge attacks in some way, you have a chance of dodging the plants too and gaining a bit of piety (which I hope they don't remove because I like it)
Bloodless - I assume this has to do with the Bloodmage or something.
I suppose. And they probably can't be petrified either.