Trimarang

The interesting part is what happens once it runs out of momentum. As it slows it stops caring about walls and stops being limited in how many things it can hit, so it hangs at the edge of its arc and grinds anything standing there. Up close it is worse than the boomerangs that went into it. Out near the limit of its reach it beats them clearly.

You do not have to wait for one to come back before throwing the next, so your real rate of fire is limited by swing speed rather than travel time. Keep all three out and the target sits in a constant stream. The weak knockback is deliberate: a heavier shove would push the target away from the boomerangs still in flight.

It carries no frostburn, even though a frost boomerang goes into the recipe. If you were counting on that chip damage you need it from somewhere else. Melee speed bonuses stretch the range because they throw it harder, and deep water cuts it short, which is worth remembering before an ocean or jungle fight.