A person? who gets summoned in another world with nothing special except an ability that let's that person? being transported or summoned in a higher plane and dimension.
And the ability activates automatically from like being summoned again or being suddenly transported to another dimension.
and staying in another dimension can let you stay at a random time vary from millenium, century, decade, years, months, days or a few seconds. Or maybe more than a millenia.
When that person? is in a new dimension from its view it can obtain something that only exist that is on that dimension as each dimensions has its special properties and more information than other dimension thus it can support things that doesn't support something from a lower dimensions.
The thing it can obtain are weapons, tools, food, armor, books, ability, concept, laws, a being from that dimension and lastly something that truly belong and something special from that dimension.
With drawbacks of suffering from anxiety, depression, memory loss, and endless nightmares when sleeping.