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 both.
Hero Protection is best used against a Bloon that will deal large amounts of damage to you. Like on the card's art, Large Bloons like a MOAB or ZOMG are a great candidate if not the best since they are hard to chip down. Likewise, Double Bloons like the Double Ceramic Bloon or certain Advanced bloons such as the Bolstered Bloon are also an excellent choice since they are generally an important part of a deck if not a flat out win condition.
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.