topaz annihilator glitch, page 24 Fizbans treasury of dragons

I'm looking at the bottom part of the weapon

while the weapon is on your person, you can use an action to cast the disintegrate spell

could you have multiple topaz annihilators, in a bag of holding, a basically be a fighter tank that deals about 100 damage per turn?

No, it requires attunement. Best you could do is 3 as a non artificer or 6 as an artificer. And I imagine in most campaigns legendary items like this are unique.

true.

i also figured out you can kill the aspect of Tiamat with 20 swashbuckler each armed with a topaz annihilator