To obtain Leda's armor and sword in Elden Ring: Shadow of the Erdtree, you must progress through her questline and defeat her in combat. Leda's questline involves meeting her at various locations, making decisions that affect her companions, and ultimately facing her as an adversary in the final stages of the DLC. Upon defeating Leda, you can loot her body to acquire her unique armor set and weapon.
Thiollier's primary goal in Elden Ring: Shadow of the Erdtree is to find St. Trina, a goddess of sleep who is also an alter ego for the Empyrean Miquella. Throughout his questline, players will need to complete various tasks and interact with other characters to unravel the mystery surrounding Miquella and St. Trina.
The main rewards from Miquella's followers in Elden Ring: Shadow of the Erdtree include various weapons, armor sets, and talismans. Notable rewards are Leda's Sword, Thiollier's Hidden Needle, Ansbach's Longbow, Freyja's Greatsword, Hornsent's Falx, Dryleaf Dane's Hand-to-hand combat skills, and Moore's Verdigris Greatshield. Some rewards are obtained through completing specific quests or making particular decisions that affect the NPCs' questlines.