Malik Hammerfury, Bolin Farslayer: Icewind Passįrontiers has sixteen heroes.On the Steam version, all heroes are free and are unlocked by reaching certain stages: The others can only be unlocked via in-app purchases: Ten'Shí is unlocked by beating Forsaken Valley. On the mobile versions, the first three heroes are free and are unlocked by beating Pagras, Silveroak Forest and Coldstep Mines, respectively. Only the first three heroes are free, the others must be unlocked to be usable by purchasing the Premium Content. On the Flash version, Heroes are activated by paying 15 stars at the Hero Room on the World Map. Gerald is for Barracks, Alleria is for Archers, Magnus is for Mages, Bolin is for Artillery, Ignus is for Rain of Fire, and Malik is for Reinforcements. The first six heroes are based on the six Upgrades paths. The first three and Ten'Shí are free, all others are Premium, only available through in-game purchases. Each hero has a unique death animation and always have a quote - as opposed to previous instalments, in which most heroes go out with a simple 'Aah!' or 'Noo!' In fact, the only Vengeance hero to have a simple scream upon death is Doom Tank SG-11 - in this case the Wilhelm Scream. Heroes also have some fundamental differences that do not affect gameplay. This ability usually cannot be upgraded, but some Heroes do get an upgraded one upon reaching level 5 and 10.

In addition, Heroes now have a passive ability that is in constant use from level one. Four standard attacks and an Ultimate Spell (renamed from Hero spell due to the overall change in alingment). Kingdom Rush: Vengeance uses almost the same system as Kingdom Rush: Origins. Kingdom Rush: Origins reuses the hero system from Frontiers, with a difference: each hero, instead of having five abilities like in Frontiers, now only have four abilities, with the fifth being replaced by a Hero Spell that can be upgraded with hero points like normal, but can be used by the player at any time, with an individual cool-down like the existing Spells. Heroes gain extra XP (experience point) in stages where higher Hero Level is expected Hero Level 5 for Buccaneer's Den, 6 for Nazeru's Gates, 7 for Snapvine Bridge, 8 for Lost Jungle, 9 for Temple of Saqra, and 10 for The Underpass. When a hero levels up they earn hero points that can be spent on five different abilities. Hero stats are more defined than in the previous game, with numbers for each stat. Once a hero is maxed out at level 10, they remain so with fully increased stats. They begin at different levels based on when they are unlocked, and while they gain experience and levels as before, they maintain their levels outside of the level. In Kingdom Rush: Frontiers, the hero experience changes. Heroes have two abilities, unlocked when they reach certain levels, and gain in power just as their other stats do. No defense is stated on the Hero page however fully detailed stats are listed when the hero is highlighted in a level. Hero stats are rated on a scale of 0 to 8 in terms of Health, Attack, Ranged Attack and Speed. When a level ends, the hero reverts back to level 1. With each new level they gain a boost in their HP and attacking strength. In Kingdom Rush, Heroes begin at level 1 and gain experience during a level by attacking enemies, before maxing out at level 10. When a hero is defeated, they immediately start to heal, and will re-spawn after a certain length of time. Heroes are immune to the instant kill attacks of regular enemies (but not bosses or level hazards). These statistics vary from one hero to the next, designed to give each hero advantages and disadvantages. While the hero cannot stand off the path, they will move over the environment, skirting the edges of obstacles to make the movement from A to B as quick as possible. You can either tap/click the hero directly, then tap/click where you would like to move them, or tap/click his icon, then direct them to any path. Hero movement is controlled with the finger/mouse. On April 25, 2012, Ironhide released the Heroes update to both PC and iOS devices, starting with a 66% discount on heroes the following day before the Rotten Forest update for iOS devices. On April 5 2012, a retina display screenshot taken from the (then) upcoming iPad showed a mage hero (presumed to be based on the Arcane Wizard), and revealed features such as a health bar, a level system, and an experience bar. Many assumed that heroes for the remaining advanced towers would soon follow. Following the announcement, many players believed the heroes seem to be based on certain advanced towers: the Holy Order, Rangers Hideout, and Barbarian Mead Hall respectively. Ironhide Game Studio revealed its first three heroes Gerald Lightseeker, Alleria Swiftwind, and Malik Hammerfury on 8th February, 2012 14th February, 2012 and 19th March, 2012 respectively.

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