After Linsley obtained the SSS-rank Annihilation gift, he waved his hand, and the couch in his hotel room was destroyed to nothingness. Not even the elementary particles were left; everything was completely annihilated.
In other words, with this SSS-rank gift, Linsley could completely annihilate stars and even an entire galaxy without leaving any remains, as even dust wouldn't be left.
Linsley could also feel that this gift extended not only to physical objects but also to souls and anything conceptual, such as memory and luck, as long as he controlled his annihilation to include those within his scope of "annihilation."
On the other hand, after obtaining the Universal Key (Gold) talent, it didn't bring any changes to his power directly, as it only granted him the ability to unlock any conceptual seals. But that alone was powerful in its own right, as he could unlock seals capable of restricting or sealing even a Great God.