This is what I have so far
1-War Club (made from small part of Ent's own body!)
3-A symbol of friendship (lets one pass safely by other Ents if one behaves oneself.)
5-Ent Transport (in an Ent's branches, they can move fast when they want/need to.)
6-A Fire Cone (pinecone, burns with a very hot flame)
8-Weapons taken from tresspassers
10 Guardian for the night (no need for a sentry with an Ent standing guard)
What other ideas do you have?