Being able to freely control its power was an extremely useful ability.
Just imagine: at a critical moment, Tony could completely drain all the mana in his body to create a super fireball.
Either he would blow the enemy to death, or he would wait for the enemy to dodge the fireball and kill him...
Although that seemed somewhat helpless, in a situation like that, having an ability he could stake his life on was incredibly precious.
Moreover, this meant that as the mana in Tony's body increased, the upper limit of his Fireball would rise too!
Judging by Tony's current mana level, a fireball made by draining it all would probably be somewhat more powerful than a missile.
That was already extremely impressive power.
Even Thor, an Asgardian, would not have an easy time if it hit him head-on.
Nick Fury could not help marveling that, with just one skill, Tony, who had originally been a complete weakling without his armor, had vaulted into the ranks of formidable fighters.
Anyone who still treated Tony as an ordinary person from now on would suffer badly for it.
By then, Tony had also finished celebrating.
But then his eyes lit up again as he looked at Su Yu. "Mr. Shopkeeper, you said before that buying fifty blind boxes would qualify me to buy higher-level ones, right?"
"That's right. The highest-grade items in Basic Blind Boxes are only green, but Intermediate Blind Boxes offer a chance of getting blue-grade items!"
At that, Tony looked embarrassed.
He had not even seen a green item yet...
But then he rallied again. He felt that his luck with Basic Blind Boxes alone did not prove anything.
Maybe his luck would arrive when he opened Intermediate Blind Boxes!
So he waved his hand grandly. "I'll start