Terraniux
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A Fairy can be enhanced with skills and spells – its damage will increase to approximately 16, with an attack every other turn. Of course, this is only possible if the game rules allow it; otherwise, it becomes a task of "how to break through a wall with your forehead" – and after a thousand attempts, the wall might eventually give way.
Regarding the hero's level, glitches start occurring from level 75 onwards, immediately jumping to level 88, negative experience, and so on. Therefore, level 108 is more of a theoretical limit, and stable progression occurs up to level 75. The same applies to skills – the theoretical limit is 127 (it is added but not displayed), but you cannot set it higher than 99, and increasing it (through artifacts or libraries) has no effect – the damage does not increase. For example, after defeating 4000 dragons and gaining experience, its attack suddenly dropped from 99 to 1.
No, it's stable up to level 75, and then there are two levels – 88 and 108. After level 108, it resets to 0 and goes up to 108 again...
The damage may not increase because it exceeds 400% – a warrior cannot inflict more than four times the damage, even if their attack is higher. For the same reason, the Bloodlust and Frenzy spells become meaningless. Defense is also not infinite.
The decrease in skills is related to the same issue – a certain number of bits are allocated for the number of skills, and it exceeds the limit (127 = 2^7 - 1), after which it resets to zero.