"The Great Terrors are fearsome monsters naturally born within the Chaos Origin Land. They are shadowless and traceless, leaving no sign of their passage. If they attack you, it doesn't matter how high your Health is, how thick your shield is, how strong your damage reduction is, or how many abilities you possess—all of it will be ignored. Escape is impossible."
"That's outrageous! So, there's no way to see them?"
"There is, actually. If they are illuminated by the glow of a Chaos Source Stone, you can see their forms. However, even if you can see them, without Chaos Damage, you can't hurt them."
"Even true damage won't work?"
"It's not that true damage itself is ineffective, but rather you can't hit them with it. It's like how Physical Damage passes straight through incorporeal beings. Only Chaos Damage can touch a Great Terror."
"I get it. Do you have Chaos Source Stones here?"