It is random: Every time you kill a certain type of monster, you get a certain probability of getting the desired drop. I am not sure about the exact probability, but in any case, you might get it with the first monster you kill, or you may have to kill 10, 20, or even more.
There is no way of telling, all monsters drop at random, if there were certain kills you have to get, the game would hardly be any fun.
The entrance to the dungeon is located in the center of Barbarian Village, near the mine. On Floor 1 you need to kill Minotaurs to get the Right Skull Half. On Floor 2 you need to kill Flesh Crawlers to get the Bottom of Sceptre. On Floor 3 you need to kill Catablepons to get the Top of Sceptre. On Floor 4 you need to kill Ankous to get the Left Skull Half. Use the two skull halves together to get a Strange Skull. Use the two sceptre pieces together to get a Ruined Sceptre. Use the Strange Skull with the Ruined Sceptre to get a Skull Sceptre.
to get an rcxd you need to get 3 kills without diying
Kills the pain. You need a shot at the dentist, so it numbs your mouth. Then the dentists can operate without hurting you as much.
You need to get 100 kills with explosions with danger close equipped
no but it has to be on normal or harder for the skull to pop up
If the parts of the skull were not fixed the brain would have much less protection. The spine is partially movable, or we wouldn't be able to bend. If it were fully articulated we would need much stronger muscles to keep us upright.
Yes, the skull can be augmented with surgery. There are areas of the skull in which the procedure is much easy to complete, and other areas that are more difficult. You would need to contact your nearest medical professional regarding specifics related to your concerns with your own head shape.
you need 9 kills
It depends on which weapon but for SMG's you need to unlock "rapid fire" and get 30 kills with it attached to get an akimbo SMG. For some shotguns, you need 15 kills to get akimbo. For handguns, 50 kills are needed. For machine pistols, you need 75 kills.
15 kills with a silencer
You need 5 Kills that can be verified.