Although there aren't that many different weapons in Horizon Zero Dawn, there are quite a few upgrades you'll find throughout your journey. Weapons you find will vary in rarity, and power.
You may be wondering where to find the most powerful weapons. Put simply, you will require several crafty materials and metal shards (currency) to purchase epic weapons from the hunting goods merchants in Meridian.
In regards to the materials listed below, you can acquire skins from hunting animals, while hearts are a rare drop. Note that if you want a Watcher Heart, for example, you will need to farm Watchers until you receive the rare drop.
Damage types will also be listed, as they are very important to your loadout.
Shadow Hunter Bow
650 Metal Shard, 1 Watcher Heart
Hunter, Hardpoint, and Fire Arrows
950 Shards, 1 Board Skin, 1 Rabbit Skin, 1 Fox Skin
Standard, Shock, and Freeze Rounds
500 Metal Shards, 1 Snapmaw Heart.
Fires ropes for crowd control.
800 Shards, 1 Sawtooth Heart
Hardpoint, Tearblast, and Harvest Arrows
Shadow Sling -
650 Metal Shards, 1 Crystal Braiding
Freeze, Shock, and Fire Bombs
750 Metal Shards, 1 Scrapper Heart
Shock, Explosive, and Fire Traps