Increase two scores by 2.

You are a Giant.

You can speak, read and write Common and Giant.

You can see in dim light within 60 feet of you as if it were bright light and in darkness as if it were dim light. You discern colors in that darkness only as shades of gray.

Due to your two heads, you are proficient in the Perception skill.

You have a natural armor of 10+ your Strength or Dexterity modifier, + your Intelligence, Wisdom or Charisma modifier.

One of the heads has to be a martial class (Barbarian, Fighter, Monk, Ranger, Rogue, Paladin, Cleric) the other a spellcasting class (Wizard,Sorcerer,Warlock). Effects on self, (buffs, etc) continue no matter who is in charge, but will abide by the same requirements. You share the same stats and gain hp through both classes. Feats, class based proficiencies and abilities can only be used by the class that chose it. Non-physical skill checks and saving throws have to be done seperately by both classes. Physical skill checks, saving throws and Iniative will be averaged, rounded up. Mental status effects (frightened, charmed, etc) only affect the head hit by it, but physical status effects (poisoned, paralyzed, etc) affect both. The highest AC of both will count, and can be affected by effects or class skills.

You have disadvantage on the Stealth skill.

Bi-Ogre's are usually between 7-10 feet. You are Large, but can fit in a 5x5 square.

Bi-Ogre's can live up to a century, and usually mature around 10.

You know the Thaumaturgy cantrip. Once you reach 3rd level, the martial class can cast Earth Tremor at 2nd level, and the spellcaster class can cast Shield with this trait. You gain the ability to recast this after a long rest.

You take turns right after each other. The spellcaster can decide whether they can go before or after the martial's turn.