Fallout: New Vegas

Adrenal Reaction

-Up to 50% bonus damage.

-50 less HP.

Bird Bones:

-Fall 50% slower.

-Limbs cripple 50% faster.

Chameleon:

-Turn invisible while standing still.

-Can't be wearing armor.

Eagle Eyes:

-Deal 25% more critical hit damage and plus 1 Perception.

-Minus 3 Strength.

Egg Head:

-Gain 25% more experience.

-Minus 2 Strength and Endurance.

Electrically Charged

-Small chance to fry opponents that punch/melee you, deals bonus damage to robots/power armor.

-You get damaged as well.

Empath:

-Your companions gain 4 DT.

-You lose 6 DT.

Grounded:

-You gain 10 DT against energy attacks.

-Energy weapons deal 50% less damage.

Healing Factor:

-You regen health and limb condition outside of combat.

-Chems only last 45% as long.

Herd Mentality:

-Plus 2 to all SPECIAL stats when with at least one companion.

-Minus 2 to all SPECIAL stats when without a companion.

Marsupial:

-Can jump 75% higher, additional 40 carry weight.

-Minus 4 Intelligence.

Scaly Skin:

-Plus 5 DT.

-Minus 25 AP.

Speed Demon:

-20% overall movement speed increase.

-Hardcore needs rate increased by 50%.

Talons:

-Deal 25% additional unarmed damage, targets bleed when struck.

-Minus 20 repair.

Twisted Muscles:

-Deal 25% additional melee/unarmed damage, weapon strength checks reduced by 1, thrown weapons go 20% farther.

-Weapon accuracy reduced by 50%.

Unstable Isotope:

-Small chance to irradiate opponents that punch/melee you.

-You get damaged as well, ghouls, robots and some mutants are immune.