Mephisto rules wrote:
The placed marker indicates that this unit is in range of Mephisto HQ’s attack.
During the next Battle, it will be attacked by the Mephisto HQ, with the same
strength and in the same Initiative phase as its normal attack.
The Quill is not an extra attack - if a Quill marker is on an enemy unit that is
already being attacked by Mephisto HQ’s normal Melee Attack, it is not attacked