Snakes.

[bobby1361]

Can snakes see invisible people?
Because i made myself invisibile while running thorugh the desert and one killed me so i lost a soul strand.

[D Blaze]

Did you by chance accidently attack the snake, or the spell faded and you not realized it happened?

Snakes do not have the ability to see invisible beings.

[Nyralotep]

Plus if the snake saw you before you went invis the NWN engine can still be locked in on you and the snake would be able to attack you.

[Nehetsrev]

I believe this sort of thing's been discussed in the past regarding a known issue/bug with invisibility & sanctuary spells not always functioning properly due to the way Bioware wrote the code, and it's not something the Layonara team can fix (to my knowledge).   But realisticly, snakes use smell and thermal sensing as their primary means of hunting prey, so they wouldn't need to see you with their eyes to know you were there and strike at you.

[bobby1361]

Thanks.
I was invisible before the snake saw me because i ran past it.And the spell didn't wear off because i died, then i came visible again!Thanks for replying.