Darkness
This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.
( 1 John 1:5 ) KJV
The crucifixion is the symbolism we need to be able to understand what God has done for us, but the sacrifice was made when God went against his own nature in order to make creating the universe possible.
The Naked Prophet 