Hero Protection is a Basic Powercard in Bloons Card Storm. It negates all damage dealt from one hit to the player's Hero from a Bloon leaking. For Bloons that hit multiple times (i.e. Double Attack and Triple Attack), only the first hit is blocked; Double Bloons effectively deal damage equal to their health instead of double. A blue aura emits from under the player's Hero while the effect is active.
Only one Hero Protection effect can be active on a Hero, and the card cannot be played if the effect is already active. If the player has both this card and Corvus Academy of Arts in play, leaking a Bloon uses the latter first. Leaking Sentinel Bloons does not break the protection.
Hero Protection is best used against a Bloon that will deal large amounts of damage to you in a single hit. Like on the card's art, high-Health Bloons such as ZOMGs are a great choice to negate the damage. It's still helpful against Bloons that hit more than once (e.g. Double Ceramic Bloon, Triple Threat Bloon), however it only blocks the first hit.
Make sure to destroy all Bloons before the one you want to be tanked by Hero Protection. Any amount of damage will be lowered to 0, even if it's from something as weak as a Swarm Red Bloon.
Likewise, if you want to disrupt the opponent's Hero Protection, send a weak bloon in the front of the queue if the other bloons have 1 delay or more.
Hero Protection is a vital tool in protecting the player against OTK or Quick Ready setups, as it forces the enemy to either use Double Trouble or have to get a Bloon leak. The often low amount of Bloons in an OTK deck makes Hero Protection a very effective card for stalling OTK setups.
Some players may use targeted delay reducers (e.g. Booster Bloon, Improved Fortification, Slowing Bloon) to alter which Bloons leak to the opponent first. It's less common outside of Aggro strategies, but in Aggro strategies Booster Bloon can be a way around Hero Protection by allowing a weaker Bloon to leak.
Against Tempo, Hero Protection can be very effective, deterring the opponent from relying entirely on a single Bloon and forcing them to combine multiple Bloons together. This is particularly effective against Tempo as it makes killing with Quick Ready much less easy to do.
Hero Protection is still powerful against single powerful Aggro cards such as Bolstered Bloon, but can be a difficult investment due to its high price.
Hero Protection was nerfed during Version 6.2 playtesting, as community playtesters noted its strength as both anti-aggro and anti-OTK;[1] the nerf to its Gold cost from 3 to 5 was proposed by a community playtester.[2]
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Adora with Hero Protection active (pre-4.0)
Quincy with both Hero Protection and Shield (pre-4.0)