Some factions offer low-damage explosives that can be used to call for aid. The Demolition Expert perk doesn’t affect the damage done by summoned allies or artillery fire, but the damage done by the initial explosion does receive a small boost.
Artillery Smoke Grenade
Damage: 1 (ballistic)
Fire Rate:0
Range:93
Accuracy:0
Weight:0.5
Value:0
You acquire the artillery smoke grenade during The Minutemen Quest: Old Guns. These explosives are used to mark high-priority targets for artillery support. They should only be used outside and within range of a workshop settlement that contains a manned artillery piece. If these conditions are met, the area marked by an artillery smoke grenade is bombarded with powerful explosives.
Synth Relay Grenade
Damage: 1 (ballistic)
Fire Rate:0
Range:93
Accuracy:0
Weight:0.5
Value:50
Toss a synth relay grenade to spawn synth reinforcements at a target location. This weapon can be obtained via a speech challenge during The Institute Quest: The Battle of Bunker Hill. Allies of the Institute can also purchase synth relay grenades from the Institute requisitions vendor after all Main Quests are completed.
Vertibird Signal Grenade
Damage: 1 (ballistic)
Fire Rate:0
Range:93
Accuracy:0
Weight:0.5
Value:50
Soon after you throw a Vertibird signal grenade, a Vertibird lands at the marked location. You can then board the vehicle to take control of it’s side-mounted minigun. When you’re ready, exit the Vertibird or use your Pip-Boy’s map to select a new destination. The Vertibird signal grenade can only be used outside, and only by Brotherhood of Steel members.