i need help with these 3 things

anyone know how to use kidler custom render to turn the person and armor invis

Or know how to make a item revive a mob using its mob head and how to make a enchant that when it kills a mob drops the head

or how to make a dimension where if you enter it set your spawns their and removes your items and to get your items back u need to find a key and door which each only have a 0.1 spawn chance per chunk.