path-of-exile
Normally skill gems tell you what their tags are so you know which support gems apply to them and whatnot, but since Bone Armour is granted as a result of allocating the ascendancy point for Bone Barrier, it doesn't seem like I have a way of seeing what the tags are.
What tags are on the Bone Armour skill? I was hoping that if it was tagged Minion I could use it in conjunction with "If you have used a minion skill recently…" effects.
There are ways to make small changes to your skill point distributions in the passive skill tree, however the intention is not that you simply 'reset' the skill tree and instead make a new character if you want to make a large quantity of changes. This is detailed on the Path of Exile website:
If you want to adjust your passive build during gameplay, there are Passive Skill Refund points available from quests or relatively rare items in the game that can be found or traded for. Fixing mistakes with a character build or improving small-medium sized aspects is relatively easy, but our intention is that players who want to try substantially divergent character builds are encouraged to play a new character through the game, organically leveling it up rather than just respeccing into it.
You'll get a few respec points from quests which each allow you to remove a single skill point, so you can try out big nodes and undo little mistakes. This doesn't remove the need to plan your skill point distribution ahead and you'll still have to pay attention.
You can refund individual skill points by using Orbs of Regret (purchased from Yeena in Act 2) but if you're level 20 or above it's easier to just make a new character.
It is not possible to completely reset your passive skill tree.
The ones that I have used, and can confirm work with Arc, are
Blood Magic
Faster Casting
Lightning Penetration
Reduced Mana Cost
List of support gems can be found here.
Any others may work, but I have not tested personally, therefore would be total speculation, on my part.
Best Answer
According to a developer reply, Bone Armour is tagged as Duration, Guard, Minion, although it's not affected by global +1 to gem level items. It however does affect "If you have used a Minion skill recently"