Best Friend

Best Friend is an activated item.

Effect[]

Spawns a decoy vaguely resembling Isaac in his crying animation, which explodes after 5 seconds with the blast radius of a Mega Troll Bomb.
- The explosion deals 110 damage.
- The explosion deals 185 damage.
The decoy bomb distracts enemies, as they will target the decoy instead of Isaac regardless of distance.

All Bomb modifier items will affect Best Friend, with the exception of Bobby-Bomb, Bomber Boy, Fast Bombs, Mr. Mega, and Rocket in a Jar.
- Scatter Bombs will create mini decoys.
Bosses such as Chub or Carrion Queen can swallow the decoy bomb just like a regular bomb.
Isaac can push the decoy bomb by walking into it or shooting it with his tears just like regular bombs.
If Isaac leaves and re-enters a room after placing the decoy bomb, its explosion timer will be set to that of a regular bomb (1.5 seconds).

Book of Virtues: Creates wisps that are small Isaac heads with a white flame in the middle ring. Tears shot by these have a 7.5% of applying the mark status effect, akin to Rotten Tomato.
Car Battery: Spawns two decoys on top of each other.
Remote Detonator + Schoolbag: The decoy bomb is affected by remote detonator.

Edmund McMillen stated that Best Friend would no longer "Die upon touch". This is a reference to a bug in the original The Binding of Isaac where, in many circumstances, Isaac could take glitched hits (often killing Isaac outright).
Best Friend works remarkably similar to Pipe Bombs in Left 4 Dead, down to the 5 second timer and not working on bosses.