Glaive

Description
Glaive fires a homing shot that bounces endlessly between enemies dealing damage until an enemy moves out of the way while it's being targeted, or there are no other enemies to target. The Glaive can also target enemies on the player's side of the field such as attacking Ligers.

Although this spell can theoretically rack up a lot of damage overall, normal enemies may easily move in an unpredictable manner a lot of the time away from it thus completely stopping the Glaive from further bouncing. This happens quite frequently, especially against particularly mobile bosses such as Selicy and Shiso, and therefore limits the Glaive from being a reliable source of damage.

Strategy and Synergy
Glaive is arguably the most effective spell to use against the Gate as the Glaive will not break since the Gate's turrets and the Gate itself do not move. This means that it can gradually rack up damage (or status effects provided you use certain Upgrades) over the course of the entire fight, easily destroying the turrets before they can cause problems for the player. Having many Glaives cast on the field at a time will speed up the fight significantly.