User blog comment:Yugiohgx5/Ark of the sealed god help/@comment-35295780-20190330100623

Kalon's attack at 50% hp will kill every unit no matter what, but it will the revive dead ones. Units with stealth (ex: nyami) are immune to it. Units with taunt (ex: ultor) can absorb the attack, but there is a chance that the taunt unit will die. If you have no unit/friend with taunt or stealth then before you reduce his hp below 50% make sure that some of your units die, because they will be revived. Then use your revive potions to revive the dead ones.

Also next time please use the Help thread.