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