Source: Dungeon Master's Guide

Potion, Uncommon

When you drink this potion, you have Resistance to one type of damage for 1 hour. The DM chooses the type or determines it randomly by rolling on the following table.

1d10 Damage Type
1 Acid
2 Cold
3 Fire
4 Force
5 Lightning
6 Necrotic
7 Poison
8 Psychic
9 Radiant
10 Thunder