Specters are afraid of it/ 2 blades: one that cuts any material and the other that cuts a window into other worlds

Used the knife to get into the living room/stones as a distraction/tabby cat attacked monkey/defended will and lyra/escaped back into other world.

In the North as an axe for the intercission of the daemons.

the sky opened/ spirits moved between the 2 worlds/lands moved/ ice melted / then sealed up again

Because of the specters/children/attack adults, she thinks it contains the whole mystery of dust/find Lyra who has the answer

used the Subtle Knife to cut and navigate their way through the other world; the tabby cat that Will saved

Asriel is gathering an army to complete the war that was fought in heavens years ago.

Tullio

He has a daemon ( a snake); He knows Ms Coulter; he can go between worlds; made money from it; knows about specters; wants the knifenly Will sees it.

His father's letters for safety

They have undergone intercision/no daemon therefore souless

His fingers were cut

He can be brutal if necessary /was bullied as a kid/  he is the next bearer of the Subtle Knife