I guess he unconsciously poured mana to the slimes in the previous half-chapter and now they poured all of it back to him and he got dizzy less from the heat and more from the overflow of mana?
Or did he just rambled randomly because of the heat?
Either way, gg MC. Soon you'll have animal eared chefs and kitchen staff to help you with the cooking
at this point i wouldn't be surprised if later on the manga it was revealed that he's some sort of sage or even a candidate to become god for that world with how much bs magic he has conjured
the body of mc cant handle his magic power, thats why its overflows and caused his dissyness here.
he was summoned as a hero with 4 other kids. these kids died/didnt made the summoning so their power was concentrated inside mc. (why it failed is another story strand). buffs like increased magic regeneration and so on. that he actually used so much magic (beyond common sense, even for the kings of the forests) actually saved his live, cause if he doesnt use the mana, his body would burst.
given thats it isnt even well explained in the novel, the manga does actually do a better job sofar
the body of mc cant handle his magic power, thats why its overflows and caused his dissyness here.
he was summoned as a hero with 4 other kids. these kids died/didnt made the summoning so their power was concentrated inside mc. (why it failed is another story strand). buffs like increased magic regeneration and so on. that he actually used so much magic (beyond common sense, even for the kings of the forests) actually saved his live, cause if he doesnt use the mana, his body would burst.
given thats it isnt even well explained in the novel, the manga does actually do a better job sofar