Ambush

Description
When cast, a thunder will strike four tiles away and surrounding tiles if the spell hits.

Strategy and Synergy
This spell can be considered the final upgrade of the, costing one more mana, but delivering twice the damage while also breaking the tiles around the enemy, which will lock them in place for a while, allowing the player to cast several spells at the stranded enemy to quickly rack up high amounts of damage.

Due to the high base damage, the spell will greatly benefit from attacking enemies, particularly when coupled with the  artifact to deliver 400 dmg to fragile targets. Those quirks are balanced by the fact of its Legendary rarity, so this spell may not show up in every run.