Maria wrote:do you have at least lvl 90 in your skill class?
Yes, I do. And I use the Endless Nova more than a few times, but it doesn't work if at the first time you put it ON the bank.
Even if AFTERwards you drag the talisman back to your inventory, the "use" button simply can't be found.
So, my conclusion is:
IF you started a fight with talisman IN YOUR BANK, you CAN'T use it in THAT fight, even after you move the talisman in your inventory.