This spell can also be used to boost spawners such as the Barbarian Hut, Goblin Hut and Witch's spawn speed, defenses such as the X-Bow's rate of fire to extremely high effectiveness or the Elixir Collector's production speed. However, it reduces the lifetime of buildings.
Rage can also be used to help rushes, and with its low cost, it can assist the Prince, Hog Rider, and other troops destroy an Arena Tower easily.
It is effective when defending Crown Towers since it will be able to affect both the defensive units and buildings.
The Rage can also be used to make slow-attacking troops such as P.E.K.K.A. or Sparky attack faster.
A high risk, high reward strategy is to send out a Minion Horde, then use the rage on them. If timed correctly, the opponent will miss their Arrows or Zap and Minions will quickly devastate the tower.
Inherently, the Rage is a high-risk, high-reward card that requires good timing in order to succeed. When using Rage, be careful to time it right or else an opposing counter attack will come unhindered due to the player's lack of Elixir.
Place it on as many powerful troops like the Giant or P.E.K.K.A. as possible to maximize its effect.
The Rage was added with Clash Royale's soft launch on 4/1/16.
On 29/2/16, the March 2016 Update made the Rage's effect fall off after 2 seconds when troops left the Rage area.
Pre-update, the Rage effect would stay with the troop, even if it left the Rage area.
On 23/3/16, a Balance Update increased the Rage's movement and attack speed boost to 40% (from 35%) and decreased its duration by 20%.
On 4/7/16, the Tournament Update changed the Elixir Collector so that the Rage will have an effect on it when the Elixir Collector is in range.
On 19/9/16, a Balance Update decreased the Rage's Elixir cost to 2 (from 3), its attack speed boost to 30% (from 40%) and its duration by 2 sec.
This update tied it with Zap and The Log for the cheapest spell in the game.
The Rage is very similar to Rage Spell in Clash of Clans, except that the spell increases attack speed instead of damage per hit. It can also speed up the fire-rate of buildings, such as the X-Bow, and boost the spawn speed of spawner buildings and production rate of the Elixir Collector, and can also make the Inferno Tower charge up faster.
It is in fact more similar to the Haste Spell from Clash of Clans.
Also, unlike the Rage Spell in Clash of Clans, the Rage does not make troops bigger.
Upgrading the Rage does not affect its AoE (Area of Effect) or its troop movement and attack speed buff, only the spell's duration.