Salamander

Description
Upon casting, fireballs will appear at every tile currently on the field, including both enemy's and the player's before starting to advance straight to the right. These fireballs will deal 40 damage on hit as well as leaving a Flame on hit if there are are currently on that tile (otherwise, the existing Flame will be refreshed). The fireballs can also damage the player.

Strategy and Synergy
The hitboxes of these fireballs start from the Flame that they originated from, making this spell at least a guaranteed hit against enemies that are standing in a tile on Fire.

Salamander is a versatile spell; it can be an offensive spell or a setup spell in a Flame deck. If there are many enemies on the field at once, this can be used to create even more Flame. As this puts a Flame on the enemy tile whenever it hits said enemy, it is a reliable way to make sure that enemies would be damaged by Flame in order to activate certain artifacts that synergizes with it, such as and. At a certain point, when there are enough Flame currently on the field, it will be able to do a lot of damage to many enemies at once.

Because the positioning of the Flame generated from this spell is dependent on the enemy's current position, it may make it easier to spread out Flames horizontally before using in combination with. As an initiator, this combo may spread Flames very easily on normal combat encounters. For this reason also, Salamander doesn't exactly fare well against bosses, especially those who moves around a lot, such as Shiso and Selicy, as the fireballs won't be able to hit them a lot of the time nor would there be enough available targets (as bosses are typically one-man battles) to be able to spread Flames easily to make it a Brushfire bait.

This synergizes especially well with. Back Burner lights up the entire row at once, which would then fire 8 fireballs, effectively making this spell a cheaper that also applies Flame and doesn't force the player to position themselves to maximize its value.