Maximum damage from an explosion in a single battle.

Has anyone tried to calculate the maximum damage that can be inflicted with an explosion under ideal circumstances in a single battle? Let's say magic power and knowledge are both 99, an Earth expert, plus a sphere, and expert-level magic (or magical earth). Let's say, for example, that an enemy unit is standing in a corner, blocked by its own blinded units. We start bombarding it with explosions until we run out of mana. And what would the total damage be? P.S. Inspired by comments about the map "Unleashing the Bloodthirsty." One foreign player writes about how he won the final battle (7 stacks of 9999 various dragons - azure, rusty, crystal, fairytale) with ONE azure dragon. He says he equipped the "Power of the Dragon Father" to prevent the fairytale dragons from attacking, and then alternately used "Berserk" and "Force Field." Practice shows that inevitably one of the stacks remains, usually azure dragons, with a size of 2-3 thousand. How do you finish them off? Especially since a considerable amount of mana is spent on "Berserk" + "Force Field." P.P.S. Of course, there was a vulnerability medal.