Power Buildings

I agree with ZYbr... especially in this case.

After that, all heroes are good, and it's very useful for a mage to have Battle as their second skill, so that at least their defense is leveled up.

Exactly. After that, they all become good. Even to level up Tactics a bit (so that they can at least be somewhat useful to those around them, although it will still be small), it takes quite a bit of effort. And Optimal should know this better than anyone. On M and S maps (in online mode), you barely have time to fully level up the main skills (like Stealth, Ranged Attack, and Battle)... let alone Tactics. At best (if you're very lucky), you can find an altar. But the