Yellow Death
From Paragon Wiki Archive
When Hamidon reaches half its total hit points, it will activate its Summon Antibodies power, causing a Mitochondria Antibody to appear for every hero within The Hive. This almost always leads to a raid wipe that cannot be recovered from, and leaving Hamidon safe until the next server reset. This can be avoided if Hamidon has been held before losing half its hit points.