I Choose a New Ability Every Seven Days

[Invincible, semi-daily] Feng Guyuan gets a weekly selection system, and he can get a special ability every week. Week 1, Option 1: Indestructible Body, Option 2: Dark Summoning Choose the Dark Summoning Technique to summon the three-headed hell dog from the gate of hell, which will bite anyone who disobeys. Week 2, Option 1: Invisibility, Option 2: Hell's Red Black Flame Choose the red and black flames of hell, the strange red and black flames, burning everything in the world. Week 3, option 1: ever-changing, option 2: thunder power Choose thunder powers, control thunder and lightning, and create thunder... Looking at the combined abilities, Feng Guyuan spread his hands helplessly: "I don't want to be invincible! But even if I am invincible, what can I do?"