|Fortress Destroyer Modules|
|- Explosive Shot -|
|Effects||10% Shrapnel damage to nearby targets|
|Growth||+2% Damage per tier|
It gives a decent boost to shrapnel, but the not ship restricted Shredder Shot is almost as good for the other ships.
And on the other side, there are other modules with much better shrapnel damage, like Kinetic Sharded Ammo and High Explosives, but they are much rarer. They also tend to be just as restricted, if not more.
Interestingly, Explosive Shot (and any splash-damage adding module) can be added to any tower, including beam towers.