Behemoth?

[Soyweiser]

I don't know if spell targeting is completely understood, but it tends to go for max potential damage. So disintegrate will target the high hp large sixed low mr creatures first.

Don't know if you can abuse this. But you could use Dark vines (Large, high hp, lowish mr) for example to test this. (If this works it is a nice trick to use as any of the frost giant races).