Duel Arena. By speaking to Mubariz at OSRS gold the entry of the Duel Arena it is possible to choose if you wish to be granted Arrows, Bolts, or Runes if you duel. On account of the fact that this may easily be using for someone to gain experience in the Magic Skill simpler (eg. Someone puts full rune, vambraces and anything they could find to lower their own Magic Attack and throw Wind Strike or another weak spell on somebody constantly so that they nearly never perish and gain an infinite number of magic experience til they max out.) Quite simply you can't use them to gain expertise. You will be awarded 300 Catalytic Runes and 1,000 Elemental Runes if you choose Runes. If you choose arrows you will be awarded 650 Spiritual Arrows.
Barbarian Assault. It simply doesn't make sense that you are being made to use your OWN Runes and Arrows at a match where you don't get experience for utilizing them. However simply giving you Spiritual Arrows which will allow you to never change does not make much sense. Each amount represents the level of the arrow.
You will be awarded 2,000 of each type of Arrow each round. If you choose Runes you will be given 1,000 Catalytic Runes and 4,000 Elemental Runes each Round. Why Not? Barrows is a minigame that costs you riches with a chance to create riches. With no dangers the game could be too simple and the costs of Barrows items would be on a rapid decline.
Clan Wars you're deciding to reflect your clan. Not necessarily a group. Additionally people might then simply start casting Bind on each other to cheap RuneScape gold obtain experience and leave if they run out of runes so they would be abusing the match unless there was a reward or motivational factor for actual battle.