Per what the system was saying, he didn't need to sit down and plan a spell as if he were planning a novel. He did not need to intricately weave spells like in the books he once read in his past lives. Thinking about that...
'System! Is there any of my lives where I was a mage of some sort?'
[Analyzing Records...]
[6 out of 100 lives found!]
[Do you wish to access them?]
[Warning: Accessing these memories is permanent and could cause changes in your personality without sufficient willpower. Do you accept?]
'First, confirm if my willpower is sufficient. I'm not so masochistic to experience mind-numbing pain.'
[Surprising...]
'What?!'
[Processing...]
'Tch!'
[Willpower is sufficient to accept memories, but you will be incapacitated for three minutes.]
[Do you accept?]
[Yes/No]
Bahamut wasted no time in selecting Yes. And he regretted it quickly.
