This macro/combo is designed to quickly deal high damage to mobs like Primal Giant Post, Scyraia, etc. However, you can also use this combination in Gyfin Lower. Also this macro is very useful in PvP situations.

Here are some recommendations:

You can use the Vicious Shadow and Kama kits; both are good options.

When you want to go behind the mobs after grouping them, all you have to do is stop holding the macro button, then press (F) and hold when the animation is over, then you can continue holding the macro button. This is very useful in Gyfin Lower if you are unable to kill a mob until it turns around.
Before you try this macro in high-level zones like Gyfin Lower, make sure you've tried it out in the battle arena.