The first is found by walking until you arrive at the first split in the path, with a teleport chest straight ahead and an illusory wall with another teleport chest to the left. Take the left chest and from the arrival spot look to the right and head down the stairs to the "same" teleport chest as was taken earlier. Walk forward and take the ladder on the left up to find a third teleport chest. Follow the path straight ahead to find the item.
The second is found from the first spot by turning around and jumping out of the window to the forward and left. From the raised landing, turn around and the items is there, guarded by a Living Jar Warrior.
1 is found in the Subterranean Shunning-Grounds in Leyndell, Royal Capital, guarded by some Living Jars and 1 Living Jar Warrior just before the elevator down to the Forsaken Depths Site of Grace. From the Underground Roadside Site of Grace head through the wooden shortcut door straight ahead. Take the pipe on the right and follow it to a drop-off point to the left leading to a door guarded by an Imp. Drop down the hole in the pipe and follow the forward path. Take a left in the split then go right and drop down the hole in the floor. Take the ladder down to find the room with the Pot and the Living Jars.
1 is found in Giants' Mountaintop Catacombs in Mountaintops of the Giants. From the Site of Grace, take the right path and then the elevator down. Take a left at the boss door and take the next elevator down and head through the guillotine room on the right and head up the stairs to the right. Continue forward until a dead-end room with a Living Jar Warrior to find the item.
Use
Ritual pots are needed to make ritual pot tools. The pots that can be created are: