Converting monsters from Second Edition Monstrous Compendiums

So, 11 HD and Huge?

Sea wyrms grow larger, but not particularly stronger, as they age; thus, the bite and constriction of a young sea wyrm are just as damaging as that of its elders.

I don't like the idea of not increasing the base damage of the natural attacks, but I can see not using the usual +8 Str for the increase from Large to Huge. Wanna leave Str unchanged, or partially increase it?
 

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11HD, Huge, increased base damage, and +4 Str sound fine. Let's give it the normal Con and natural armor boosts for size, though.
 

I just realized this...

It looks like we have ranges 7-10 HD for young and 11-14 HD for elder, so let's go with 10HD for the "standard" sea wyrm and 14HD for the elder sea wyrm, if everyone agrees. We can let the standard one advance to 13 HD, and the elder can advance how we like.

Fixed Advancement on lesser sea wyrm.

Added greater sea wyrm to Homebrews.

For the breath weapon, we can just borrow the brass dragon's cone of sleep gas and fit it appropriate to its size...

Breath Weapon (Su): 50-foot cone of sleep gas, once every 1d4 rounds, Creatures within the cone must succeed on a DC X Will save or fall asleep, regardless of HD, for 1d6+8 rounds; effective both on the surface and underwater. The save DC is Constitution-based.

We'll need to increase the size categories for constrict ship. Maybe...

Constrict Ship (Ex): A greater sea wyrm can wrap its serpentine body around all but the largest ships and crush them or drag them below the waves automatically. This can be done to a rowboat (1 round), keelboats (5 rounds), or longship (10 rounds). Sailing ships, warships, and galleys are too large for a greater sea wyrm to affect in this way.
 
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Updated.

Adult and ancient sea wyrm have other attacks as well. If they make a bite attack and score 5 more than they need to hit, they have swallowed their prey whole. The victim takes normal damage (2d6) from the bite and an additional 2d6 paints of damage per round thereafter from stomach acids. The usual methods may be employed to escape from the creature’s stomach.

Borrow from the similarly-sized and shaped behir?

Swallow Whole (Ex): A behir can try to swallow a grabbed opponent up to two sizes smaller than itself by making a successful grapple check. A swallowed creature takes 2d8+8 points of bludgeoning damage and 8 points of acid damage per round from the behir’s gizzard. A swallowed creature can cut its way out by using a light slashing or piercing weapon to deal 25 points of damage to the gizzard (AC 15). Once the creature exits, muscular action closes the hole; another swallowed opponent must cut its own way out.

A behir’s gizzard can hold 2 Medium, 8 Small, 32 Tiny, or 128 Diminutive or smaller opponents.
 



Updated.

Skills: Climb +15, Listen +15, Spot +15, Survival +10, Swim +24, plus 16 ranks

Feats: Combat Reflexes, Improved Initiative, Lightning Reflexes, Power Attack, 1 more
 

Cleave, since other monsters (behir and purple worm) indicate that swallowed = "dropped" for the purposes of free attacks. We should specify this in a Feats entry, however.
 

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