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Oh my God! Today I witnessed "Battle Frenzy" for the first time. After using it, the little dragon simply collapsed, crushing a snail. At level zero, it deals 1600-1900 damage!!! It's truly insane. Three drawbacks: it hits allies (although this is easy to avoid; this kind of area-of-effect spell is best used on the starting position), the area is a bit small (but quite sufficient), and it requires a lot of rage (but it builds up quickly with special abilities). It's best used at the beginning of the battle to hit as many enemies as possible while they are clustered together. Afterwards, "Dive Attack" is better, especially with the reduced cost. With such damage, it's no wonder that the little dragon deals 50-70% of the damage in battle!
"Lightning Bolt" - but it's useless at the beginning! And it becomes more expensive with level. Moreover, it's only effective against large groups. I still prefer "Lava."
"Treasure Hunter" - I'm not convinced. I don't play on "impossible" difficulty, and on "easy" (don't judge me, it's my first playthrough), I don't have any problems with gold.
Well, I haven't had a situation where the wall was that useful. And the knight has weak magic. Why does he need mana (or a mana accelerator)?