Giant Killer

Giant Killer is a generic Talent that increases your Basic Attack damage against high-Health targets. The bonus damage is negligible against enemies with low maximum Health, but against targets with a high Health pool it can double your damage. For instance, if an enemy hero has 5000 health, your Basic Attack will deal an additional 75 damage on top of the damage it already deals. It has no real synergy with high attack damage, but it is much stronger the higher your Attack Speed is.

Mechanics
Giant Killer is an attack modifier that deals an additional instance of Percent Damage to the primary target of the Basic Attack. As such, Giant Killer cannot trigger, if the target Evades the Basic Attack or the attacker is Blinded at the moment of impact.

Being dealt in Percent Damage, The damage from Giant Killer is unaffected by both offensive and defensive damage modifiers (such as Armor) making it one of the strongest tools against Tanks. The effectiveness of percent-based damage is capped at 36.5 (+4% per attacker's level) damage per percent for every instance dealing Percent Damage, but this rarely has any effect, as there are only a few Heroes in the game whose Health pool is high enough to exceed this cap in normal play.

Base Version:

 * Sgt. Hammer (Talent is identical, but at level 16)

Modified Version:

 * Artanis' level 16 Talent "Titan Killer" causes his Basic Attacks deal additional damage equal to 0.5% of the target Hero's maximum Health. Basic Attacks empowered by "Twin Blades" have this amount increased to 1.5%.
 * Cassia's level 16 Talent "Martial Law" causes her Basic Attacks against enemy Heroes to deal additional damage equal to 1% of the target Hero's maximum Health, increased to 3% against Heroes that are Stunned, Rooted, or Slowed.
 * Falstad's level 13 Talent "Sustained Winds" causes his Basic Attacks deal additional damage equal to 1.5% of the target Hero's maximum Health, increased to 2% while his trait "Tailwind" is active.
 * Fenix's level 16 Talent "Offensive Cadence" causes every 3rd Basic Attack against the same enemy Hero to deal additional damage equal to 6% of the target's maximum Health.
 * Gazlowe's level 16 Talent "Overklock" causes his Basic Attacks to grant him Movement speed and deal additional damage equal to 2.5% of the target Hero's maximum Health.
 * Greymane's level 16 Talent "Alpha Killer" causes his Worgen form Basic Attacks to deal additional damage equal to 3% of the target Hero's maximum Health.
 * Hanzo's level 16 Talent "Giant Slayer" causes his Basic Attacks and Scatter Arrow hits to deal additional damage equal to 1.5% of the target Hero's maximum Health.
 * Illidan's level 16 Talent "Fiery Brand" causes every 3rd Basic Attack against the same Hero to deal additional damage equal to 7% of the target Hero's maximum Health.
 * Leoric's level 13 Talent "Spectral Leech" causes his Basic Attacks to deal additional damage equal to 2.5% of the target Hero's maximum Health and heal Leoric for twice that amount.
 * The Lost Vikings' level 13 Talent "Nordic Attack Squad" causes each Viking's Basic Attacks to deal additional damage equal to 1.25% of the target Hero's maximum Health while all three Vikings are near each other.
 * Raynor's level 16 Talent "Bounty Hunter" causes his trait empowered Basic Attacks to deal additional damage equal to 3% of the target Hero's maximum Health and grant himself Armor for a short duration.
 * Rehgar's level 16 Talent "Hunger of the Wolf" causes Ghost Wolf attacks to deal additional damage equal to 5% of the target Hero's maximum Health and heal Rehgar for 5% of his own maximum Health.
 * Sonya's level 16 Talent "Giant Slammer" causes her Basic Attacks and Seismic Slam to deal additional damage equal to 1.5% of affected Heroes' maximum Health.
 * Tychus' level 16 Talent "Sizzlin' Attacks" causes his Basic Attacks to deal additional damage equal to 1% of affected Heroes' maximum Health and stacks with Minigun.
 * Valla's level 16 Talent "Manticore" causes every 3rd Basic Attack against the same target to deal additional damage equal to 5% of the target Hero's maximum Health.
 * Zagara's level 16 Talent "Corrosive Saliva" causes Hydralisk and Roachling attacks to deal additional damage equal to 1.75% of the target Hero's maximum health.

Removed
These Heroes no longer have Giant Killer as a Talent option.
 * Thrall
 * Zeratul