Horizon of Darkness

What level does this skill occupy? If the golem is destroyed (or lost), is the slot freed up? Is it possible to recreate the golem if it is lost?

So, does each message sent to the familiar consume a charge? If so, does this apply even to messages sent to the carrier? Or is this aspect of the skill free?

Does each use of levitation consume a charge? How are charges consumed? Can I specify "levitates over the forest and conducts reconnaissance" (not with my stats, but just as an example), or is it something one-time, in the spirit of "I fly to that hill"?

It was originally conceived as a combat heal with the possibility of use outside of battle, but that's okay. Can I heal the golem this way?