i dont think lava has a direct weakness to lightning as its flexibility allows it to abosrb the vibrations better so the lava whip might not work but whatever

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as soon as you look upward to smash the kunai away i quickly deatonate them sending a large amount of heat and shards of rock and bits of dust flying into your eyes temporarily blinding you and causing you to recoil slightly due to the power of the explosion forming a row of handseals (the ones neccesary for the melting apparation tech) at the same time immedaitly after ive finished performing the handseals (just after the kunai explode) I shoot out a massive sheet of lava that spreads above, to the sides and behind you blocking any kind of escape route before coming down on top of you, while simutaneuosly causing the ground beneath you to melt sending you sinking under the ground just after the lava sheet lands on you causing you to be thougrouly burnt and crushed to death by the massive heat and density the lava posses (due to the fact that your attention would be drawn toward the sky you wouldnt notice this until it is to late)
Ps: if im going to hard ignore this move and ill do another one
(Yoton: Yōkai no Jutsu) -Lava Release: Melting Apparition Technique
Rank: A
Type: Offensive
Range: Short - Mid
Chakra cost: 30
Damage points: 60
Description: After performing Dog → Boar → Tiger → Ox → Rat → Bird hand seals the user releases a large amount of lava from their mouth, which spreads into a broad, thin sheet as it travels through the air. Since the lava is shot upwards in an arc, so as to descend onto the targets from above, it prevents the intended individuals from jumping up to avoid the attack. A great deal of steam is created afterwards by the effects of the lava, so should the targets still be alive, a follow-up attack can be conducted while their vision remains obscured.
(Yoton: Yurasu no Kazangan) - Lava Release: Rock to Lava
Rank: S
Type: Supplementary
Range: Short-Long
Chakra Cost: 40
Damage Points: N/A
Description: A jutsu that helps bring out more substance for magma jutsu, can also add a certain twist to the battlefield by changing a rocky terrain to a fiery terrain of lava.