Derivable necklace with lots of spikes, please note that the mesh is rather high on polycount(17k), could cause lag on very slow computers. There is a ligher version of this mesh with less spikes
here
M00 - Chain
M01 - Long spikes
M02 - Rings attached to long spikes
M03 - Short Spikes
M04 - Rings attached to short spikes
The templates:
Spikes: