I - Rules
(see RTL, p. 30)
This ability is only used during outdoor encounters. Any figure with Soar is considered to be flying above the ground, and the range both to and from it is increased by four spaces.
A soaring monster cannot normally be the target of a melee attack. However, monsters with Soar can choose to swoop down before attacking. If they do so, the extra range is negated until after the attack goes off, at which point the monster flies back up. Heroes may use interrupt attacks (even melee attacks, if in range) to attack a monster while it is swooping.
Note that all monsters with the Flying ability also automatically have the Soar ability.
II - References
Heroes with the Soar ability: none.
Skills granting the Soar ability: none.
Feats granting the Soar ability: none.