So they're the same on the Metatype priority chart as Dwarves except I have to spend 7 Karma to take them, so I'm taking them as Priority C, so I get 1 extra Special Attribute. Their stats are:
BOD 1/4 | AGI 2/7 | REA 1/6 | STR 1/4 | WIL 2/7 | LOG 2/7 | INT 1/6 | CHA 1/6 | EDG 1/6
Their Racial Traits are: Arcane Arrester (2), Neoteny and Thermographic Vision
Arcane Arrester (2): When targeted by a spell (including a critter's Innate Spell), the character is harder to affect. This potent ability make casting both benevolent and malevolent spells on these characters much more difficult. The character adds (Level x 2) dice to their resistance test against any spell. If the spell is one that is not normally resisted (such as Invisibility), the character still rolls their Arcane Arrester dice pool of either two or four dice and reduces the hits rolled on the Spellcasting Test by any hits they roll. For instance, if a mage casts Invisibility on a character with Arcane Arrester 2 and gets 4 hits on a Spellcasting Test, the target character rolls 4 dice and gets 2 hits, meaning only two of the hits on the Spellcasting Test are used to make the target invisible. Arcane Arrester cannot be combined with Magic Resistance (p. 76, SR5). This quality can be taken by characters with a Magic attribute, and it affects spells they cast on themselves.
Neoteny: Neotenous characters have halted during development and retain the physical traits of a child or adolescent (up to a thirteen-year-old) even though they are legally adults. Given the absence of certain traits common to adults (height, body hair, facial changes, deeper voice, and so on), they can easily be mistaken for children or teenagers. Gamemasters may modify certain Social Tests depending on how an NPC will interact with the character. People often underestimate children, which may give a neotenous character an advantage. The character's lack of physical development reduces his default Physical Condition Monitor to 6 + (Body/2, rounded up) boxes and may result in social modifiers.
Characters with Neoteny need custom armor and equipment, causing a ten percent increase in lifestyle. They also suffer social stigma and modifiers.
And their Thermograhic Vision is the same as Dwarves.