Rengar's Bonetooth Necklance not available in store

{quoted}

bonetooth necklace isn't a thing anymore. it was removed because they decided the rengar passive thing on the necklace should just be one of his passives

This.

You see the bonetooth icon right above his Q icon now.

It stacking and the bonuses it gives are still the same.

The main reason why they removed it from the trinket was that if Rengar was behind, he had a level 1 yellow/red trinket while everyone else had a level 2/3 trinket.