We can get several things from chests:
"guaranteed", we receive the item marked with such a word every time, without looking at the other conditions;
"chance", we receive an item marked with such a word if fate meets the condition, "75% chance means that we have a 75% chance of receiving this item", without looking at the other conditions;
"one from the pool" things marked with this word are drawn from among themselves, we receive only one of them, these things have their own chance of being drawn (100% in total).