Edward starts with one hidden blade and a pair of swords. Here's exactly when you get every major weapon upgrade and how it changes your options.
Second Hidden Blade
Unlocked: Sequence 4, shortly after arriving at Great Inagua (story-mandated, not missable).
Enables double assassinations from stealth — cover, air, grass. Also unlocks chain assassinations (kill two enemies in rapid succession without breaking stealth). This is a massive stealth upgrade.

Dual Sword / Dual Wielding
Unlocked: Sequence 5, via crafting. You need jaguar and black jaguar pelts (found around Great Inagua and Cape Bonavista jungles) to craft the second weapon holster.
Dual-wield moveset:
- Faster light chains (four hits instead of three).
- A dual-heavy spin attack that hits all surrounding enemies.
- Dual-kills when two enemies are simultaneously at low posture.
It's not a raw damage upgrade over a single heavy sword, but crowd control improves dramatically.

Rope Dart
Unlocked: Sequence 6-7 (story unlock, Templar key progression). Lets you hang enemies from branches/beams, yank them off their feet, and (on ships) pull them overboard. One of the most satisfying tools for creative stealth kills.
Extra Pistol Holsters
Crafted from animal pelts:
- 2nd pistol: Iguana + Ocelot (Cape Bonavista, available Sequence 1)
- 3rd pistol: Jaguar + Black Jaguar (Great Inagua jungles)
- 4th pistol: White Jaguar + Red Howler Monkey (Isla Providencia, late-game area)
Four pistols lets you chain four quick-shots in combat before reloading — devastating against agile enemies and captains.

Blowpipe Darts
Sleep and berserk darts unlock in Sequence 3-4 via story. Buy upgrades at general stores; pouch capacity comes from animal-pelt crafting. Berserk darts in particular are overpowered — hit an officer or brute and they'll attack their own allies, creating free chaos.

Loadout Recommendations
General play: Dual swords + four pistols + smoke bombs + berserk darts handles everything.
Stealth-focused: Keep a single sword for quieter kills; carry extra smoke and sleep darts instead of the fourth pistol.