The Archaic Petra is a good Geo set that you will get from the Domain of Guyun. It comes with a nice Geo damage increase as its 2-piece bonus and a further 35% damage increase from picking up the Elemental Shard you create via the Crystallize reaction to a specific element it was created with.
4-Piece: Upon obtaining an Elemental Shard created through a Crystallize Reaction, all party members gain 35% DMG to that particular element for 10s. Only one form of Elemental DMG can be gained in this manner at any one time.
This is a fantastic Geo set, great for Traveler (Geo), Noelle, Ninguang and Zhongli due to its 2-piece 15% Geo bonus. You should ony equip two of the set as there are better sets out there.
This guide for Genshin Impact includes the following:
Based on version 1.4
Coming soon! An interactive Map of Teyvat showing the location of all; Anemoculus, Geoculus, Statues of the Seven, World Quests, Shrines, Plants, Monsters, Enemies, Chests and Minerals.
Detailed Character pages of all playable characters showing talent trees, skill builds etc.
Weapons - Showing the current best and highest rated weapons in the game.
All Archon Quests that tell the main story of the Traveler and Paimon as they travel the world of Teyvat in search of the Traveler’s missing twin sibling.
All World Quests that are unlocked by speaking to NPCs through Teyvat. They give insight into the various locations and stories of the world.
All Story Quests consisting of chapters related to the background and personalities of each playable character.