How deal with "balls" creature ?

[Ezzi]

When I see random small or huge ball-creatures.
Hard kill it. It's strong than other creatures in same place.

I'm stupid confused this.

[Hinnyuu]

The big "balls" are called entites ;) They're among the hardest regular enemies, and the ones you can find very early on in the game are best avoided.

As for how to beat them - they are elementals, so using the opposite of their element works well. They have very high physical defenses, but you can get through that with strong weapons, or use Expose to reduce their defense. It's important to protect against their spells, both the elemental damage and the status effects - equip the right protective gear, and it's not a huge problem later on in the game.

[Amygdala]

Also, you don't have to fight them. IIRC they only attack you if you use magic

[Hinnyuu]

Yes, neutral enemies generally only attack if you use any kind of magic near them - even if it doesn't target them.

[Pendergast891]

as a heads up too, don't try to reflect because iirc their powerful spells naturally pierce reflect