Knife + branch = arrow shaft.
Dagger + branch = spear.
There is indeed a difference between daggers and knives when it comes to combinations.
Oh, and yes, most item combos require a certain crafting skill. In a future update, your hero will say either "that will never work" for combos that don't do anything ever, or "I can't do that yet" if his crafting level is not high enough. So that at least that is clear.
That's good to hear. Clear messages are helpful messages.
