Teleport a player after killing all npc?

Merry Christmas to everyone, so i will go straight to the point, i have been wondering how i could teleport a player by killing certain at once, if i am referring to multiple NPCs would i need a bool or string? as for the teleport function i would be using Cframe and suggestion for improvisation of the script would be accepted, any answer is accepted and link to a Roblox Wiki about the certain problem and would solve it is also accepted. Thank you in advance for everyone who would give the time and dedication to respond :)