Monstrous Monday: Sea Dragons (BECMI special)

It's another BECMI Monstrous Monday.  This is Expert Week and few creatures really exemplify the Expert experience to me (either B/X or BECMI) than sea monsters and dinosaurs.

As it turns out, the Field Museum agrees with me.
https://blockclubchicago.org/2020/02/28/move-over-t-rex-field-museum-is-bringing-in-ocean-dinosaurs-for-special-exhibit/

Or. At least they were going too.  Back when I planned this posting Covid-19 had not yet hit.

Sea Dragons are some of my son's favorite creatures.  As before I am going to go with the BECMI format for the monster stat block.

Dragon, Sea
Armor Class: 3
Hit Dice: 12**
Move: 30' (10') Sea dragons are slow and clumsy on land.
   Swimming: 270' (90')
Attacks: 1 bite + 1 breath weapon (steam)
Damage: 5d8+5
No. Appearing: 0 (1d4)
Save As: Fighter: 12
Morale: 10
Treasure Type: H
Alignment: Neutral
XP Value: 2,700

Breath Weapon: Cloud of steam, 60' x 40'

Sea Dragons are an ancient type of dragon that some scholars believe are among the first of dragon kind.  They are known to swim in the deepest of seas where they make meals of all but the largest of sea creatures.

Sea Dragons also attack boats that swim into their territory.  They attack with a bite only and a dangerous breath weapon of superheated steam.  The steam is stored in a pressurized organ in the dragon's body.  This allows it to survive at depths that would crush other creatures.  It also allows the steam to become hot enough to melt soft metals.  Protection from fire, magical, or otherwise offers no protection from this breath weapon.  Damage taken is equal to the number of current HP the dragon has, save vs Dragon Breath Weapon for half.

Unlike other dragons, Sea Dragons do not cast spells or speak. They can speak, but typically only to other dragons.

Sea Dragons keep treasure in undersea lairs, usually inaccessible to surface dwellers.

Sea Dragons are believed to honor ancient immortal members of their species called Apsû and Tiamat, representing the Sweet and Salt waters respectively.