Converting original D&D and Mystara monsters

[Shade]

Coiled Motion (Ex?): Once per hour, an undine can shape itself into a coil, increasing its swim speed to 120 feet. It may move at this speed for up to a minute.

Fast Healing (Ex): An undine heals only if it is fully submerged in water.

Water Transparency (Ex): An undine's transparent body grants it total concealment underwater.

Borrow this from sahuagin?

Water Dependent (Ex): Undine can survive out of the water for 1 hour per 2 points of Constitution (after that, refer to the drowning rules on page 304 of the Dungeon Master’s Guide).

 

[freyar]

Coiled Motion should be Ex, I think.

That water dependency could work, but I'm maybe thinking of something the reverse of a vampire's weakness to being submerged (but not as powerful). Maybe:

Water Bound (Su?): Each round that an undine is not submerged in water, it takes 1 hit point of damage.

 

[demiurge1138]

I like freyar's suggested Water Bound.

 

[Shade]

Updated.

Amount of fast healing?

+9 natural amor like Large water elemental?

Skills: 22

Feats: 3
Large water elementals have Cleave, Great Cleave, Power Attack

 

[demiurge1138]

Fast healing 3.

Natural armor sounds good. Feats are just okay; Swim-by attack isn't OGL, is it? If it's not, Dodge, Mobility and Spring Attack might also be contenders.

 

[freyar]

I don't think swim-by attack is OGL, no. Let's go for the Spring Attack chain.

The rest sounds good.

 

[Shade]

I like that feat chain for them. Sprinkle in some ranks in Tumble to go along with that theme?

Maybe Concentration 11, Tumble 11?

CR 6?

A typical undine is 12 feet long and weighs around x pounds. (Medium water elemental = 8 ft. 280 lb., Large 16 ft. 2,250 lb.)

Undines speak Aquan and x. (Terran, since they dislike hordes, or Celestial, since they are usually good?)

Oh, and I think we forgot this...

The undine itself is immune to all water-based attacks

Borrowing from the hydrax...

Immunity to Water (Ex): An undine is immune to the detrimental effects of spells with the water descriptor.

 

[demiurge1138]

CR 6 and Celestial work for me.

 

[freyar]

That all sounds good. Are they done?

 

[Shade]

We just need weight (see my earlier post for similar water elemental weights).