DARK SOULS II: Scholar of the First Sin
38 Achievements
1,000
80-100h
Supreme Weapon
Reinforce a weapon to its limit
50
28.8%
How to unlock the Supreme Weapon achievement in DARK SOULS II: Scholar of the First Sin - Definitive Guide
You need a total of 6 titanite shards, 6 large titanite shards, 6 titanite chunks, and a titanite slab. Also, each upgrade costs souls, which depends on the weapon and level.
+3 - takes 6 titanite shards to this point.
+6 - takes 6 large titanite shards to this point.
+9 - takes 6 titanite chunks to this point.
+10 - takes one titanite slab.
You can reinforce your weapon at Blacksmith Lenigrast in Majula, Steady Hand McDuff in the Lost Bastille, and Weaponsmith Ornifex in Brightston Cove Tseldora.
Titanite shards are easy to come by, particularly as items found in lower level areas, can be bought from Lenigrast, and Chloanne has an unlimited amount of them to sell.
Large titanite shards are easy to buy, McDuff sells an unlimited amount, as does Chloanne. They are also dropped by various enemies such as Old Ironclads (turtle guys) in the Forest of Fallen Giants.
Titanite chunks are more difficult, Chloanne sells an unlimited amount after the final boss is defeated. They are also a rare drop from Gyrm Warriors in the Doors of Pharros. The fastest way to get them is to join the Bell Keepers as you receive one with each successful invasion.
Titanite slabs are very rare, but not quite as bad as in the first game. Chloanne sells one (late-game), another is inherited from McDuff, they can be given by Dyna and Tillo in Things Betwixt, and one from the Pharros contraption underneath the ballista room in the Forest of Fallen Giants. Another is dropped by the dragonrider in the Undead Crypt. You have a chance to receive a titanite slab when defeating an invading Bell Keeper grey spirit.
The Bell Keeper covenant also gives a chance for a titanite slab for defeating a host (instead of a chunk), and you also receive one for reaching rank 1 (10 kills). Stone statues near the King's Gate bonfire in Drangleic Castle may drop slabs, allowing to farm slabs. Thanks to Catatonic Nali for this information.
You will need the following to max out a regular weapon: 6 Titanite Shards, 6 Large Titanite Shards, 6 Titanite Chunks, 1 Titanite Slab (most of these are found through natural progression, a slab can be found in the Lockstone room below the Ballista room of Forest of Fallen Giants). Plus, the required amount of souls to upgrade the weapon. The easiest blacksmith to find is Lenigrast in Majula. Speak to him and buy his shop key from the merchant by the Cardinal Tower bonfire, then head back and open the store. Once you upgrade a weapon to +10 with the above items, this will unlock.
For this trophy, you need to reinforce any standard weapon to +10 or special weapon to +5 using Petrified Dragon Bones or Twinkling Titanite. I recommend reinforcing a standard weapon as it is much quicker and easier. The Fire Longsword you can find in The Forest of the Fallen Giants is an excellent choice. You should find plenty of materials playing the game naturally, but if not, Stone Trader Chloanne will sell everything that you need once you have defeated the final boss. You will need the following:
6 Titanite Shards
6 Large Titantite Shards
6 Titanite Chunks
1 Titanite Slab
The fastest way for me to collect materials is to run through the Harvest Valley and the Forgotten Fortress, therefore to Brightson-Tseldora Bay. I started with a guide - how to get the Agape ring at the minimum level or stay forever young.