I - Rules
(see JITD, p. 22)
A figure with Command adds 1 to the damage and range of all attacks made by friendly figures within three spaces of it (including itself, and ignoring line of sight). If there are multiple figures with Command within three spaces of a figure, the effects stack (e.g., the figure would add 2 to the damage and range of its attacks if two figures with the Command ability were within three spaces of it).
II - References
Heroes with the Command ability: none.
Skills granting the Command ability: Blessing.