My Invincible Ultimate Has Too Many Prerequisites

When demons lay siege to his sect, a lowly outer disciple secretly holds a bizarre system: the more shamelessly he flaunts in public, the closer he gets to godlike power. While the sect's golden boy steals credit for reviving a sacred beast and repairing the barrier, he quietly charges his meter to 100%. But when the Demon King arrives, obliterating both their ancestor and the arrogant golden boy in a single blow, total doom falls upon the sect. Is it finally his time to step forward?