This item can only be placed in Guild Halls and grants the Heartbond buff spell for those who use it.
Using it "binds" two characters from two different accounts as though they are a couple and provides buffs.
There is no limit on the number of characters that can be bound per account.
For example, 23 of your characters on one account can be bound to 23 different characters on 23 different accounts. Likewise, 23 of your characters can be bound to 23 different characters on a single account instead, provided that account differs from the one your characters are on.
When you are Heartbound with someone you will the Suffix Title ", Heartbound of [Heartbound Char]"