Synth relay grenade

The synth relay grenade is a weapon in Fallout 4.

Characteristics
Tossing a synth relay grenade causes a level 5 generation 1 synth to spawn where it lands, and serve as reinforcement.

Locations

 * Allies of the Institute can purchase up to 30 synth relay grenades at a time from the Synth requisition officer after the main quest has been completed.
 * 3 grenades can be obtained via a Speech challenge from the Courser during The Institute version of the quest: The Battle of Bunker Hill.
 * 8 grenades are found lying on a table in the small weapons testing area of the Institute Advanced Systems area. Another 5 can be found on a shelf in the Institute SRB.
 * Can be found by pickpocketing an Institute Courser's main weapon from their inventory, exiting, then checking again. They'll equip the grenade, and it will become visible for stealing.
 * Can be found as loot on Coursers at higher levels.