Indeed. The purpose of this thread is to establish that these things do not drop, or if they do to provide a counter example.
T2 poison barriers are a thing, and do not require proving of any sort. I believe in them already, but Santa Clause, the tooth fairy and ultra poison barriers do not appear to be real-- or at least findable by players. I don't doubt that they are in the code as consumables that could be generated by a developer/game master.
EDIT: Updated the OP with information about finding it and not mailing me, just to make sure this is as clear as possible.
The barrier picture must be of your knight in game with a dropped ultra poison barrier. Hover your mouse over it so that we can all see that it did in fact come from T3 and not wherever else.
must be only TIER 3 ultra venom barrier, NOT TIER 2