Arching Throw is an encounter power available to the Barbarian class at level 23.[PH2:59]
Arcing Throw (Power)
Barbarian Attack 23
Ranged 5/10
Target: one creature
Attack: Strength vs AC
Hit: 5[W] + Strength modifier damage, and the target is slowed until the end of your next turn.
Special: When you use this power, you can make the attack with a melee weapon as if it were a heavy thrown weapon. If it is a magic weapon, it returns to your hand after the attack is resolved.