Siegward of Catarina is a NPC in Dark Souls 3. He wears the Catarina Set and wields a Zweihander, along with the Pierce Shield.
Siegward of Catarina Information
This NPC can be killed.
Assists in the boss fight with Yhorm the Giant.
Gives "Toast" gesture.
Gives "Sleep" gesture.
Gives "Rejoice" gesture.
Rewards you with Titanite slab if you free him in the irithyll dungeons.
Gives you free beer or "Siegbrau", maybe its rum, who knows?
Please note there are bugs in this questline addressed with patch 1.05
Step 1: You can first find Siegward of Catarina at Undead Settlement (see page for map). He will be located just past Eygon of Carim, and he will be coming up the lift. After speaking with him and exhausting his dialogue, he will move to a ledge nearly at the top of the lift. You can roll off if timed right and speak with him again. Help him fight the Fire Demon here to get some gestures and a Siegbrau.
NOTE: If you didn't talk to him when you first saw him on the elevator, he will despawn. However, if you go to the Fire Demon, his dialogue will appear, and he will join you to fight the demon. If you die during the fight he will spawn again. If he dies during the fight, he will not respawn
Step 2: Next, he will be found in a well outside of the Cathedral of the Deep's Cleansing Chapel bonfire (see page for map). You won't be able to speak to him until you have completed these steps:
You must open the big double blue doors across from Rosaria's Bedchamber Bonfire leading out to the graveyard (these doors can be accessed by either using the golden lever in front of Rosaria's Bedchamber bonfire, or by using an elevator to the left of the boss fog gate).
Reload the area, then speak with him.
Obtain his armor from Unbreakable Patches Then return it to Siegward in the well. (If you have the Catarina Set from NG, you may use that instead)
Step 3: After saving him from the well, he can be found in Irithyll of the Boreal Valley (see page for map), through a small sewer connected to the lake near the Distant Manor bonfire, resting by a fireplace. He has made some Estus Soup and toasts with the player again. You can get gestures here if you missed them in the first encounter (Toast and Sleep).
Note: He may not appear here if you have entered Irithyll Dungeon, instead his quest-line continues at the next location. However if you don't meet him there he doesn't join you for the Yhorm fight.
Note: If you did not speak with Siegward in the well outside the Cleansing Chapel you can still have this meeting with him even if you went to Irithyll Dungeon. Simply go talk to him in the well and give him his armor and immeidately after he can be found by the fireplace.
Step 4: In Irithyll Dungeon, Siegward will be locked up in a cell. You do not need to talk to him to free him, but if you wish to do so make your way to a pit full of rats and a sleeping giant standing in the pit. There is a dungeon cell window, where you can find Siegward locked up. You need to free him. Be careful of the rats while talking to him, as they respawn many times.
From here you must find a sewer area with two chests, one of them contains the Old Cell Key, which you will need for step 5. Beware of Basilisks that spawn afterwards.
Step 5: To get to Siegward's cell door, head to the Profaned Capital bonfire area. Take the ladder down and bypass some rubble, a Headless Gargoyle will show up right before a series of narrow corridors. Go through the corridors and be careful not to fall through the holes in the floor. You will emerge to find a church located in a swamp. The church is surrounded by Sewer Centipedes and the sticky water causes Toxic buildup. Take the ladder on the right of the church and make your way to the roof of the church. On top of the roof is a hostile NPC who drops Logan's Scroll. From the roof towards the stairs, there is an open window in the wall that you need to jump through. You will have to jump from the roof to enter, and it leads to the cell. Using the Old Cell Key frees him and nets you a Titanite Slab. You'll also find Covetous Gold Serpent Ring in his cell.
If you have already vanquished Yhorm the Giant OR if you skipped one of the encouters from his questline, and if you want to get his Armor set (non-permanent drop, gets lost upon refresh) instead of an additional/equal Storm Ruler only, then Siegward of Catarina has to die here by your hand. Be sure to get your Titanite Slab through conversation first.