aun'va - the ultimate tarpits?

[neutrino]

okay here my thinking his wierd rules that means that he needs to equal or get higher then the ap of the attacks could effectively tie up any monstrous creatures or other units with ap1/2 weapons since he effectively would have a 2++

[Learn2Eel]

Theoretically, yes, though that is incredibly risky as against most enemies with AP1/2 weapons, they will inflict instant death if you fail. Aun'shi makes a great tarpit unit as well - challenge a character (or be challenged, in the case of Chaos Space Marines) and constantly re-roll your failed +4 invulnerable saves.

[NockerGeek]

Aun'va would make a poor tarpit because the Paradox of Duality only works against shooting attacks. An MC's attacks will squish him dead, no save.

[Tynskel]

You kill him with Lasguns.