Sinncross said ...
I have a question, how does co-op actually work?
First you need to get the 3 bell items, Beckoning Bell, Small Resonant Bell, Sinister Resonant Bell.
When you have at least 1 insight warp back to the dream world and the messengers on the floor will give you this bell.
In order to get the Small Resonant Bell and Sinister Resonant Bell you must have 10 insight in order to merchant to appear just outside the house window/door, after that you can purchase the bells for 1 insight each. The merchant will disappear if you go below 10 insight.
I order to use the Beckoning bell you need to be in an area where the boss has not been defeated, ring the bell and it will open you up for others to enter. The player that wants to join you must then ring the Small Resonant Bell, this can usually take between 10 seconds to a few minutes. To make this easier to connect select options and go to network, in network set your region to worldwide, for some reason this never worked when set to local, and set a unique password and give this to the person that wants to co-op with you. Also note that your levels must not be more than 10, so a level 31 player cannot join a level 2o player, but 21 and 31 will be fine.
After successfully creating the co-op session you will also get a notification that a sinister bell is ringing, the Bell Maiden has entered your world and opened you up for invasion, you need to seek this bell Maiden and kill her in order to prevent invasions, if you do not you may get invaded continuously.
Also take note that any player being summoned into another players world for co-op will have 30-40% reduced health and only receives half the amount of blood echoes as the person who summoned them.
The same applies for the Sinister bell, you can ring it at any stage and you will be summoned into a co-op world to defeat the targets. If your summons dies you will still be invaded until you kill the Bell Maiden so keep that in mind, 1 on 1 invasions can still occur.
After you defeat the boss your co-op session will end.
There is a 4th bell that you get later in the game called the Choir bell, it takes 10 bullets to use but will heal everyone in your co-op party. You can have up to 2 players join your world and then another invader.
On top of all of this you can also co-op Chalice dungeons but it works slightly differently, the person that wants to coop needs to create the Chalice Dungeon and then set it to public, there will also be a key on the bottom right side looks something like eeg768fw gives this you your co-op partner. The co-op partner now goes to the Chalice Tombstones and says search for public game, enter this code and it will enter you into the dungeon. When the main user has entered the dungeon ring the beckoning bell and the partner rings the resonant bell, you will no be warped into their dungeon. Completing each layer will disconnect the co-op session and you will have to either reverse the summoning, so summoner becomes the summoned or the other player can run through the layer by themselves and then ring the bells at the next layer to continue the session.
On a side note it seems the Nightmare Frontier area will be the main PVP area, as no matter your co-op status there is always a bell Maiden there so you can be invaded in this area 1 on 1 unless you kill the Maiden.