Converting prehistoric creatures

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Ok.

To start, upsizing the Robertia would give us these ability scores:
Str 5, Dex 10, Con 13, Int 2, Wis 12, Cha 4

Do we want to use these ability scores as-is?

demiurge suggested giving the Diictodon a massive racial bonus to Survival since these animals (or their immediate descendants) survived the Permian extinction.
 

Yes. 1 HD. Ability scores from size increase would go:

Abilities: Str 5, Dex 10, Con 13, Int 2, Wis 12, Cha 4

Which I think is alright, but could see an argument made for keeping Dex at 12.

Edit: Ninjaed by IPR! I still stick to my guns for a huge (+4 to +8) racial bonus on Survival checks.
 

Dicynodont, Diictodon
Tiny Animal
Hit Dice: 1d8+1 (5 hp)
Initiative: +1
Speed: 15 ft. (3 squares), burrow 10 ft.
Armor Class: 13 (+2 size, +1 Dex), touch 13, flat-footed 12
Base Attack/Grapple: +0/-11
Attack: Bite +3 melee (1d3-3)
Full Attack: Bite +3 melee (1d3-3)
Space/Reach: 2-1/2 ft./0 ft.
Special Attacks: —
Special Qualities: Arid adaptation, low-light vision, scent
Saves: Fort +3, Ref +3, Will +1
Abilities: Str 5, Dex 12, Con 13, Int 2, Wis 12, Cha 4
Skills: Hide +9, Listen +5, Spot +5, Survival +9
Feats: Alertness, Weapon Finesse (B)
Environment: Temperate or warm deserts
Organization: Solitary or pair
Challenge Rating: 1/4
Treasure: None
Alignment: Always neutral
Advancement: 2 HD (Tiny), 3 HD (Small)
Level Adjustment: —

This little creature looks a bit like a gopher with a parrot's head, though its legs are splayed out like a reptile's. A pair of small fangs is situated directly behind its beak.

Diictodon is a dicynodont, an herbivorous therapsid (“mammal-like reptile”). Dicynodonts are characterized by their parrot-like beaks, two tusks in the upper jaw, and barrel-shaped bodies with splayed legs. The diictodon is one of the most abundant of all dicynodonts.

Diictodons are burrowing animals, similar to modern gophers. A mated pair of diictodons shares one burrow. Diictodons commonly make burrows near seasonal floodplains, where food is more abundant than out in the open desert. During cooler parts of the day, diictodons emerge from their burrows to forage. Diictodons survive drought conditions by digging up and eating plant roots and tubers, these often being enough to sustain a pair until the next rainy season.

Male diictodons have larger tusks than females - the most ancient known example of sexual dimorphism.

A diictodon is a foot and a half long and weighs about four pounds.

A diictodon familiar grants its master a +3 bonus on Survival checks.

Combat
A diictodon encountered on the surface will scurry as fast as it can back to its burrow if it is spooked, giving an alarm call to warn its mate or any other diictodons in the area. If cornered, a diictodon will bite.

Arid Adaptation (Ex): A diictodon does not need to make Fortitude saves to avoid taking nonlethal damage in conditions between 90 degrees and 140 degrees. In conditions of extreme heat (above 140 degrees) it must make Fortitude saves like any other creature, but gains a +4 racial bonus on this save. In addition, a diictodon needs to drink only half as much water as similarly-sized creatures.

Skills: A diictodon has a +8 racial bonus on Survival checks.
 
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Looking pretty good! I'm for Dex 12 for no particular reason. +8 to Survival works for me.
 

Wait a minute...I just noticed something. if Robertia is Diminutive and has Weapon Finesse, shouldn't its attack bonus be +5? (+4 for size, +1 for its Dexterity)
 

Wait a minute...I just noticed something. if Robertia is Diminutive and has Weapon Finesse, shouldn't its attack bonus be +5? (+4 for size, +1 for its Dexterity)

Correct. I appear to have missed the size modifier. Nice catch!

Fixed.

Diictodon looks good, and CR 1/4 seems about right. They're slightly hardier than cats, but have less damage output and worse AC.
 

How about we give them arid adaptation? Similar to the musk ox arctic adaptation, but for environmental heat, plus they only need half the water of a creature their size/no water? I can see Diictodon getting all of its moisture from the tubers and seeds it eats, like a modern day jerboa.
 


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