Orb Walking is a technique that bypasses the game's aggro system to allow a hero to harass safely in lane without drawing creep attention. If a hero auto attacks using auto-cast, the hero will be attacked by enemy creeps and towers nearby. However when a hero casts a spell, this attention is not drawn and the creeps will not attack. Manually casting an auto-cast spell such as Frost Arrows counts as a "spell cast" to creeps and not an auto attack. This fools the creeps into not attacking the hero. Heroes with auto-cast attack modifiers can safely harass enemies this way, making more efficient damage trades against the enemy in lane.
While most attack modifiers can freely stack, there are a few exceptions:
- Anti-Mage's mana break does not stack with Diffusal Blade
- Multiple chain lightning modifiers do not stack