The Firestarter challenge begins in the Geothermal Caverns of Tomb Raider and involves you finding a number of sacks hanging from various surfaces. You are given the task to use your torch or fire arrows to destroy the sacks. Here’s where you can find them all:
Sack #1: Coordinates – 712678, 3416011
Location. This sack can be found at these coordinates after a tunnel with a vent in it. Go past the gas cloud, turn around, and you should see the sack through a gap in the wall above the tunnel exit.
Sack #2: Coordinates – 712686, 3416019
Location. At these coordinates you will find a room with a bright lightbulb hanging from the ceiling. The light from the bulb actually conceals this sack behind it. Use survival instincts to highlight it.
Sack #3: Coordinates – 712707, 3416018
Location. This sack is found in another room near a vent. To access the room you’ll need to climb up some cages and run up a wall, go through another room with smaller cages, then drop down.
Sack #4: Coordinates – 712706, 3416027
Location. This is found in the same room as the last sack, bit a bit higher and on the other side of the room.
Sack #5: Coordinates – 712698, 3416031
Location. Go to these coordinates and you’ll find this one hanging from the ceiling near a sort of fence made of wooden beams and sheets of metal.
Sack #6: Coordinates – 712687, 3416008
Location. At these coordinates you should find yourself in a tunnel-like path. Look through an opening in the wall to the west to see this sack hanging from the roof of the cavern.