Lava Flowhttps://irowiki.org/wiki/Lava_Flow

Lava Flow
Type:	Offensive Skill
Levels:	5, selectable
SP Cost:	50 + (Skill Level × 10)
Cast Time	1 second
Cast Delay	0.5 seconds
Cooldown	(11 − Skill Level) seconds
Duration:	5 seconds
Target:	Ground
Area of Effect	7x7
Status	Stun Burning
Prerequisites
(Mechanic) Fire Earth Research Lv. 1

Lava Flow (Alt: Magma Eruption) is a 3^rd class offensive skill available as Mechanic. This skill was implemented among other skills with the Lv175/60 expansion.

Inflicts Physical Damage to all enemies in a 7x7 area around the targeted location, and places a volcanic eruption in the same place and area that will inflict Neutral property piercing damage every half a second. The main strike has a 90% chance of leaving them stunned, while the volcanic damage ignores the accuracy check, and each hit has a chance of leaving them burning.

• The volcanic damage seems reducible in PvP and sieges although it isn't clear for now. Racial cards are not affected but Valkyrja's Shield does reduce the fixed damage.
• The volcanic damage is unreducable except by Ghost property.
• Eruption may end earlier depending on the number of enemies inside the Area of Effect. Similar to how Sanctuary damages Undead property and Demon race monsters.
• All damage parts carry effects that activate when physically attacking, such as the Moonlight Dagger.

• Although it is stated that maximum of 3 instances of this skill can be placed before the first one expires, it is actually impossible to have more than 1 instance at the same time, as each instance lasts 5 seconds and their cooldown has a minimum of 6 seconds.