Belt of Giant Strength.
It was a legendary belt of Strength made of the skin of the Frost Giant king. It allowed the wearer to have the Strength of an adult Frost Giant. It was the best belt of Strength of the material plane. If you wanted better equipment, you could only find them in other places. The complete Belt of Giant Strength should be two pieces, namely the "Belt of Giant Strength" and "Glove of Giant Strength". However, the Glove of Giant Strength was destroyed in a legendary battle. That was why a legendary wizard enchanted it and upgraded the Belt of Giant Strength from a grade 1 legendary item to a grade 2 legendary item.
Thus from then on, the Belt of Giant Strength was the only item left!