Frenzy fever

Research once again goes a step too far with the invention of medicine that will give you the frenzy virus.

• Increase your constitution by 1 up to the maximum of 20.
• You are infected with a mutated version of the frenzy virus. You gain all effects of the frenzy virus sentient race template on page 80 of the Amellwind's Monster Hunter Manual except the impaired healing effect. You can still heal from nonmagical items.
• At DM's discretion, whenever you hit a creature with your natural weapon attacks (claws or bite mainly), they can have the creature make a constitution saving throw equal 8 +your proficiency bonus + your constitution modifier. On a failed save the creature is infected with the frenzy virus (See page 80 of the Amellwind's Monster Hunter Monster Manual.) On a successful save, the target is immune to your mutated version of the frenzy virus, forever.