That probably depends on how we want them to be created. We know that greater segarrans are created by 12th or higher level clerics, so lesser segarrans might be created by 7th or higher level clerics. In that case, maybe break enchantment with a CL check vs some reasonable DC could change a lesser segarran back. What do you think?Sure! Is there some way to break the curse on them to restore them to their original form non-fatally?
Segarran, Lesser
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ALIGNMENT: Chaotic evil
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SPECIAL ATTACKS: Fight and save as 5th-level warriors
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Lesser segarrans are usually created from devoted followers, but they also can he created from infant crocodiles using a spell granted only to Ragarra's priestesses. These lesser servants have average human intelligence and can communicate in Midani or any of the dead tongues of the Ruined Kingdoms.
Combat: Lesser segarrans fight using the tactics and weapons of 5th-level human warriors, though their supernatural strength lends them a +2 bonus on damage. If unarmed, they attack by biting for 2-16 (2d8) points of damage. All lesser segarrans have 10% magic resistance.
Segarran, Greater
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ALIGNMENT: Chaotic evil
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MOVEMENT: 12 (as human), or 9, Sw 12 (Fl 18, D)
HIT DICE: 9+18
THAC0: As priest
NO. OF ATTACKS: 1 (as human) or 2
DAMAGE/ATTACK: By weapon type +6 or 3d6 (bite)/2d10 (tail)
SPECIAL ATTACKS: See below
SPECIAL DEFENSES: See below
MAGIC RESISTANCE: 20%
SIZE: M (6' tall) or H (30' long)
Only Ragarra's most favored high-level priestesses become greater segarrans as a result of powerful magic. Once transformed, they retain their original human form. Furthermore, they can also assume a towering reptilian shape at will, with the transformation taking but a single round. This reptilian form depends on the personality or whim of the priestess, but usually includes at least the head and tail of a giant crocodile, At 16th level, a greater segarran's reptile form can also include a pair of giant bat wings, permitting her to fly at a rate of 18.
Combat: While in human form, Ragarra's chosen fight using the tactics, magical items, and weapons of priests, though their supernatural strength lends them a +6 bonus on damage. They never wear armor, though they may use magical Items (such as a ring of protection) to enhance their Armor Class.
Segarrans are special minions of Ragarra, an ancient, evil goddess of the jungle, typhoons, and revenge, once openly worshipped in the Ruined Kingdoms.
Habitat/Society: Once, when the powers of Ragarra were great, even her lesser servants could assume human form and walk the city streets unnoticed; now they are limited to their half-reptile form.
They are found primarily in the Ruined Kingdoms and Zakhara's earten jungles, but they sometimes can he encountered mingling with human society at night, when they can hide their monstrosity through careful disguise. More oftenn they are used as defenders for Ragarra's few shrines or as protectors for her chosen few.
Ecology: All segarrans are voracious carnivores. Though they usually subsist on animal meat, they ritually devour their enemies' remains at the end of every battle. When slain, they return to their original (human or baby crocodile) form.

Although they retain most of their priest spells from before the transformation, greater segarrans cannot memorize the highest level spells to which they are normally allowed (for instance, a 13th-level priestess, while a greater segarran, cannot memorize or cast her 6th-level spells).
In her reptilian form, a greater segarran can attack with her massive jaws (3d6 points of damage) and swipe up to 3 opponents standing beside or behind her with her powerful tail (2d10 points of damage). At 16th level, a segarran's bat wings can also be used for two wing buffets instead of flight, each inflicting 2d6 points of damage. All victims of a tail swipe or wing buffet must save vs. paralyzation or be stunned for 1-4 rounds.
Habitat/Society: In addition to the loss of her most powerful spell, a priestess of Ragarra must have a Wisdom of 17 and be at least 12th level to complete the exhausting ceremony that transforms her into a greater segarran.
In return for such power, the priestess must swear to undertake a difficult quest or perform a dangerous service for her goddess. Those few who disappoint Ragarra are punished with a painful demise and suffer an eternity of undeath.
More details about the cult of Ragnarra can be found in Chapter Three of the Campaign Guide.
Ecology: Greater segarrans can easily infiltrate human society. The only clue to their monstrous nature is their craving for raw meat. They must eat the flesh of their fallen enemies as a tribute to Ragarra.
Monstrous humanoid, I guess? Also, I think at least the greater version, if not both, should be a template.
I'm thinking monster for lesser, template for greater.
And monstrous humanoid seems appropriate.
Yes to swim speed. Maybe hold breath as well?
I'm trying to find details on Ragarra (to determine if she has a favored weapon). All I've found so far:
Ragarra: Goddess of the jungle and its violent denizens, passion, chaos and revenge
Sure! Is there some way to break the curse on them to restore them to their original form non-fatally?
That probably depends on how we want them to be created. We know that greater segarrans are created by 12th or higher level clerics, so lesser segarrans might be created by 7th or higher level clerics. In that case, maybe break enchantment with a CL check vs some reasonable DC could change a lesser segarran back. What do you think?
Well, they're not quite as good as a 5th level NPC fighter, but could they be as high as CR 4?
)I'd say speak Common (and Midani?). 200 lb. Advancement and treasure are good.
Here's the SQ:
Magic Form (Ex): Lesser segarrans are magical creatures, created from humans or baby crocodiles by a ritual carried out by clerics of Ragarra of at least 7th level. A true seeing spell reveals a lesser segarran's original form, and lesser segarrans return to their original form on death. In addition, a break enchantment spell will return a lesser segarran to its original form if the caster succeeds on a DC X caster level check.
(I'd say maybe DC 21-2, which is the DC for a 4th level spell plus the segarran's SR. But I'm not sure of the number; this should probably be pretty tough.)

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.