@Joseph Mackay look at the new Rules for the colossal squig which is only 300 points:
-1 to hit, MWs on the charge, dmg and spawning squigs when he dies, 8 attacks hitting (2+, 3+, rend -2) of which each 6 to hit deals D3 MWs, another 10 attacks and one shooting attack at 16 HP, 4D6 move and a 5+ save.
pretty much better than the Leviadon in every way (the -1 to hit is huge).