The Hand Crossbow in Baldur's Gate 3 can be found in multiple locations across different acts in the game:

• Act 1 Locations:
  • On Barth's corpse near Emerald Grove (left side, near Dammon).
  • For purchase from Roah Moonglow in the Goblin Camp/Shattered Sanctum.
  • On a dead caravan agent near the cave with the survivors on The Risen Road.
  • On a shattered Duergar in the Decrepit Village in the Underdark near coordinates X: 11, Y: -200.
• Act 2 Locations:
  • Can be purchased from Roah Moonglow in Moonrise Towers.
  • Hellfire Hand Crossbow is on the corpse of Yugir in the Gauntlet of Shar in the Shadow-Cursed town north of Moonrise Towers.
• Act 3 Locations:
  • The Hand Crossbow +2 is found in a strongbox in Lady Jannath’s Estate in the Lower City of Baldur's Gate (requires lockpicking with a difficulty of 15).
  • The Hellfire Engine Crossbow (a heavy crossbow) can be crafted in the Steel Watch Foundry from various parts.

Additional notes:

• The Hand Crossbow is a one-handed martial ranged weapon with 1d6 piercing damage.
• Variations include Hand Crossbow +1 and +2 with added damage and enchantments, and special versions like Hellfire Hand Crossbow with fire-related effects.
• Vendors like Dammon and Roah Moonglow may sell hand crossbows in their inventory as well.

This covers standard and special hand crossbow locations and how to acquire them in Baldur's Gate 3.