Jada and Jade 2
The fireball spell from Jada wasn't able to deal any useful amount of damage to the Wailing Woman, but that hadn't been what Jada was aiming for anyway. Just like Rina, Riveting Night had trained the spellcasters of Umbra in the arts of battle in the game, and she divulged a core secret of combat that many players would take a while to grasp.
That was the real effects of attacks or spells. As should be expected, a hurtling ball of fire would definitely deal some minor explosive damage, so using it to knockback a foe at a crucial moment would be important.
While this might seem like common sense, it hadn't been something players figured out easily. After all, the system did its best to let the players figure out everything on their own.
So naturally, most had to learn this nifty trick through repeated battles against foes. Some of the Elite and above players outside had already gotten an inkling of this, yet this wasn't that much of a big deal anyway.