Let's do that, then, so we can all agree on something.
I'd disagree if you weren't all agreeing with me!
So we're talking something like this:
Shadowsponge ("Air Stealer")
Huge Aberration
Hit Dice: 7d8+49 (80 hp)
Initiative: -2
Speed: fly 30 ft. (6 squares)(average)
Armor Class: 11 (-2 Dex, -2 size, +5 natural), touch 6, flat-footed 11
Base Attack/Grapple: +5/+17
Attack: Slam +7 melee (1d4+6)
Full Attack: Slam +7 melee (1d4+6)
Space/Reach: 15 ft./10 ft.
Special Attacks: Engulf, gas
Special Qualities: Blind, immunities (poison, sleep, paralysis, polymorph, stunning and critical hits), cannot be flanked
Saves: Fort +12, Ref +0, Will +2
Abilities: Str 18, Dex 6, Con 24, Int 3, Wis 11, Cha 3
Skills: 10
Feats: 3
Environment: Space
Organization: Solitary or group (2-6)
Challenge Rating: x
Treasure: None
Alignment: Always chaotic neutral
Advancement: x
Level Adjustment: —
Hmm, 7 Hit Dice seems quite low for a Gargantuan creature.
Should we increase the HD or shrink it to Huge?