Harassment

Harassment is the process of damaging enemy Heroes during the laning phase to keep them from farming, to gain lane dominance or to drop their HP to prepare for a kill.

Strong harassment can force the enemy to play extremely defensive, spend a lot of money on consumables, repeatedly return to their base and miss out on experience and lasthits.

Means of Harassment
The most basic form of harassment is simply damaging the enemy Hero with physical attacks. Directly attacking an enemy Hero will draw creep aggro, which means that nearby enemy creeps will attack you. This can partly prevented by right-clicking the ground to move into attack range, performing one or two attacks and immediately retreating to avoid being damaged by creeps.

When manually used, castable attack modifiers like Viper's Poison Attack or  Huskar's Burning Spears will not draw creep aggro at all, making them extremely powerful harassment tools.

Most damaging spells can be used for harassment purposes. Especially suited are slowing abilities like Crystal Maiden's Crystal Nova because they allow the user to perform some additional physical attacks on a fleeing enemy, as well as spammable abilities with a low mana cost such as  Clockwerk's Rocket Flare.

Items that provide some early mana regeneration (e.g. Soul Ring, Clarity Potions or Arcane Boots) can greatly increase the harassment potential of a Hero. Although ranged Heroes are generally better suited for physical harassment, an Orb of Venom can allow some melee Heroes like Riki to harass very effectively.

Countering Harassment
Physical harassment should be countered with items that provide Damage Block, HP regeneration or Armor: A Poor Man's Shield, combined with a Ring of Health can render a Hero almost immune to regular harassment.

Harassment with Spells can be mitigated with a Magic Wand, as they will constantly gain charges and provide the weilder with a steady supply of Mana and HP.

In some laning situations, it is better to force a small skirmish and attempt to kill an enemy Hero instead of just passively allowing the enemy to gain lane dominance through constant harassment. For example, a Vengeful Spirit and  Pudge lane will quickly lose the lane against  Drow Ranger and  Ancient Apparition in terms of harassment. However, they have a distinct advantage if they try to kill their opponents instead of just passively laning against them.

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