In order to get each character's ultimate weapon, you need to collect totems and take them to the matching Wey Shrine with the appropriate character:
(Have Tal take to Kariston)
1. South Courtyard / Portcullis Puzzle
Press the switch on the balcony between the gates to open the door below. In the chest is a totem.
2. New Brightwater / Valuable Cargo Quest
Recover at least 5 items from Brightwater Beach to get a totem reward.
3. Transentia / Airship Dock Puzzle
Move crates near dock to find a chest with totem.
4. Transentia / Robot testing Challenge
Climb ladder on City Level 3 and speak with robot. Accept the challenge, climb second ladder and defeat Hunter-Killer to get a totem.
(Have Buki take to Mo)
1. New Brightwater / Kirklin's Tent
Get Kirklin-Rah's key by beating the Pearl Collector quest. Go in his tent at the Shadani encampment, climb a wall and find a chest with the totem.
2. Illumina Countryside / Spirit Canyon
Climb the wall next to the bridge to find a path behind the waterfall and a chest with a totem.
3. Shadani-Mo / Trials of Mo
Beat Queen Ghara, return to Shadani-Mo and talk to Malik to start the Trials. Leave the village, go left, dispel a wall with Ailish and enter the Trials. Beat them to earn a totem.
4. Illumina Countryside / Rivet Point Stair Puzzle
At the switch that extends the staircase, explore the end of the balcony to find another wall to climb. Climb down that wall and find a room with a chest and a totem.
(Have Ailish take to Olivetess)
1. Brightwater Beach / Smuggler's Shack
Use Ailish's dispel on wall in back of shack. In the chest is a totem.
2. Parham County / Wishing Well
Use Ailish's dispel on side of well. The chest at the bottom has a totem.
3. Temple Mo / Treasure Room
In the Eagle Chamber, unlock the green gate during the incense puzzle. In the chest is a totem.
4. Transentia / Omnium Collector's Quest
Bring Miss Lupa 21 chunks of Omnium to earn the power plant key. Climb the wall outside the Observatory with Buki to get to the Elevator Power Plant. Inside the chest is a totem.
(Have Elco take to Lebius)
1. Temple Mo / Fountain Room Secret
Dispel a wall to the left of the entrance with Ailish, then fly across the pit with Elco and nab the chest with the totem.
2. Illumina Countryside / Copper Field Flying Puzzle
Find a ladder to the left before the stairs to Rivet Point. Power Elco's rocket and fly across to the green switch, then fly back through the barricade near the ladder to find a chest and a totem.
3. Transentia / Cogwheel Puzzle
Fly west from the top of the second ladder while fixing the elevator near the dock. The chest with the totem is on a small side ledge.
4. Transentia / Heart's Heart Quest
Talk to Heart outside of the Rusty Cog Tavern. Then beat Krenn and the robots at the base of the mine to find Heart's lost circuit. Bring it back to her to get a totem.
Thanks to Revolution reader B-man!