Currently all of the Cantrip's the are available are on the mage,
Truth. Our discussion is a bit theoretical at this point in the game and slightly off topic. Perhaps we should shelve it until such time as it becomes relevant.
I hate to reignite a debate just when it seems to have been settled, but it actually turns out the Cantrip issue is relevant. Not all cantrips are on the mage. There is an Enchantment Cantrip called Standard Bearer that can be attached to any friendly soldier creature.
Obliterate only removes its target from the game.
The effects of of objects attached to the target are unable to trigger, but the objects attached to the target (like enchantments) are otherwise unaffected by obliterate. Enchantments attached to it are still sent to the discard pile.
If we had an Incant that said Obliterate target enchantment or Equipment. It would stop Force Blade and Barkskin cantrip effect
Shad0w's statement reinforces my conviction that my original interpretation is accurate. If the soldier creature was obliterated, Standard Bearer would still be returned to its owner's spellbook.