Why Am I Invincible When I Start a Useless Profession?

[National job transfer] + [Cool article] + [Invincible] + [Upgrade] + [Funny] My name is Su Ze, and I changed my profession to a useless professional summoner. Skills have long forward swing, insufficient output, lack of defense means, high mana consumption, brittle skin... What should I do? ! Um? Awakening the system? Skill forward swing length? The system directly provides summoning skills without forward motion. Not enough output? Is it enough to have an output greater than that of a nuclear bomb? Lack of defense? Wouldn't it be better to resist directly physically? … "Where is our summoner? Protect the summoner! Don't you know this profession is fragile?" "Well, he seems to be rushing ahead of the human shield." "???" The all-powerful and invincible summoner can transform into a boxer or a swordsman, and can be used as a human shield or as an assistant. Aren't you a useless profession? Why are you invincible? (The protagonist is invincible all the way, has no poisonous points, and the introduction is weak. Let's move to the main text and enjoy)