Sword Wave - Guardian 1h Sword attack chain
The projectiles pierce, so it’s not quite 1 target, unlike certain other ability chains that have some AoE and then a single target (Warrior sword, Mesmer sword, Tool Kit, probably more).
Plus, getting 3 hits out of it makes it a good condition spec weapon since it procs Justice a lot more than other weapons.
If I am not mistaken the sword wave actually reflects projectiles, my mistake I was thinking of Zealots defense