Combat Arts/Heat Guard
There are six Heat Guard Combat Arts available to Spheromancers: two first-level, two second-level, and two third-level arts.
Recoil Trumpet

Perfect guard an attack and counter with a flaming explosion. Causes Burn.
Recoil Trumpet is a heat-elemental, level one Guard-type Combat Art. It costs 1 CP to activate and 1 SP to use.
When using it, Lea creates a small arc of flames in front of her and holds up her guard. If she is hit within a short duration of using the art, she perfectly guards the attack, mitigating all damage it would've done, and counters it with an explosive strike that causes Burn.
Recoil Trumpet is great against enemies with predictable and slow attacks that deal large damage, such as Bosses. It is generally also very useful for players who struggle with perfect guarding, as it gives a much larger time window for the perfect guard to occur.
Ring of Fire

Creates a ring of fire around you, dealing damage to enemies walking into it.
Ring of Fire is a heat-elemental, level one Melee-type Combat Art. It costs 1 CP to activate and 1 SP to use.
While Ring of Fire is active, Lea deals fire damage around her, slightly knocking hit enemies back. The ring lasts for eight seconds.
Ring of Fire can be useful for defensive builds that like to be in the midst of enemies. It provides a significant damage boost that doesn't require the player to actively fight the enemies. Because it deals fire damage, it can also be used to melt ice, making it useful for certain puzzles that include ice pillars, such as those in Temple Mine.
Kindling Fanfare

Perfect guard an attack, jump into the air and counter with a fiery laser beam.
Kindling Farfare is a heat-elemental, level two Guard-type Combat Art. It costs 2 CP to activate and 3 SP to use.
When using it, Lea creates a small arc of flames in front of her and holds up her guard. If she is hit within a short duration of using the art, she perfectly guards the attack, mitigating all damage it would've done, and jumps into the air to counter it with a fiery laser beam similar to that of Flare Burn!. The laser beam is fired towards the direction from which the enemy attacked.
The same strategies Recoil Trumpet has also apply to Kindling Farfare.
Burning Pulse

Create a long lasting fire circle that erupts in flaming outbursts several times.
Burning Pulse is a heat-elemental, level two Guard-type Combat Art. It costs 2 CP to activate and 3 SP to use.
While Burning Pulse is active, Lea deals fire damage around her, slightly knocking hit enemies back. The circle of fire lasts for eight seconds. During this duration, the circle also erupts each second, dealing damage in a larger radius. The damage from these eruptions can't knock enemies back.
The same strategies Ring of Fire has also apply to Burning Pulse.
Ignite Embers
Perfect guard an attack, lock enemies in an upwards combo and finish with a hellish downwards laser.
Ancient Sun
Conjure forth the power of the Sun and immolate yourself in fire making melee attacks burst out in flame for a short while.