Shadowcloak says (from the ToI rulebook):
Shadowcloak
A figure with the Shadowcloak ability is only affected by
attacks made by adjacent figures. The figure does not suffer
any wounds or effects from attacks originating farther than one
space away.
Does that mean the OL can attack shadowcloaked heros (or other monsters for that matter) from the distance, gaining threat for every two surges, but not harming the target?
A similar tactic would be accessible to the heros with the Staff of Knowledge (the one that makes the OL lose threat).