AnWan
And once again, someone else's strength increases and he gets nothing. Seriously, when will Michael get an incredible opportunity. It's been so long since he got something that really increased his strength. Bow his only strength boosts seem to come from bloodlines.
he upgrades his sin constitution to lv 12 at chapter 997 and then further upgrades it to his current rainbow constitution at chapter 1094-1096. you can go back and read those chapter and see for yourself
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Michael should get a bloodline and Grand Art for his next breakthrough. If there are only five human Grand Lords, there are probably at most ten Grimm Grand Lords. That's not enough to harvest even if all Grimm Grand Lords had a bloodline. He's always complaining that the bloodline and grand arts holders are busted when it comes to development. He should take advantage of that.