If you placed a tile with spell circles, they draw in ghosts from the 8 surrounding tiles. If there are not enough, you have to take the remaining ones from the supply to fill all the spell circles on the tile.
Special case: If there are not enough ghosts in the supply, the remaining spell circles remain empty.
Note: As with the expansion, you must add ghosts to meeples if you expand or limit the mist (see Exp. 11 - Ghosts, Castles & Cemeteries).
If, at a later time, you place a tile next to another with a mist that has at least 1 occupied spell circle, you must place even more ghosts. Again, it depends on whether you continue or limit the mist. 
>> Continue the mist
If you place a mist tile in such a way that at least 1 of its sides continues an existing mist, you must add 1 ghost (from the supply) to another player’s meeple on the game board, as usual.
If there is at least one occupied spell circle in the mist you have continued, you must place another ghost. You take 1 ghost from one of these spell circles and add it to the meeple of your choice belonging to another player.
You may distribute the ghosts among several meeples.
If you close a mist with spell circles, you add all the ghosts that are in spell circles in this mist to meeples from another player. Here, too, you may distribute the ghosts among several meeples.
Example 2: You place this tile and continue the mist with it. So you place 1 ghost from the supply to the blue meeple. As there is an occupied spell circle in the mist, you also take 1 ghost from one of the spell circles and add it to the yellow meeple.
>> Limit the mist
If you place a tile in such a way that at least 1 side of the mist is adjacent to one side without mist, you must, as usual, add 1 ghost to one of your meeples.
If there is at least 1 occupied spell circle in this mist, you must take all the ghosts from these spell circles and add them to your own meeples. You may also distribute the ghosts among your meeples.
Important: A maximum of 3 ghosts are allowed to be added to a meeple. Then you immediately return the meeple to the supply.
If you are required to add more ghosts to your meeple, you must add the remaining ghosts to another of your meeples.
If you have no more meeples on the board, the ghosts are forfeited and returned to the supply instead.
Example 3: You place this tile and limit the mist with it. So you add 1 ghost from the supply to your meeple. Since there is an occupied spell circle in the mist, you additionally take 1 ghost from the spell circles and add it to your meeple.