"Volcanic Fissure"

May each Volcanic Fissure's projectiles hit the same target more than once from a single attack like Molten Strike?

i mean, may each projectile from a single Volcanic Fissure hit the same target ?

And damage increases for melee hits like "Endurance charges on Melee Stun Support" affects those projectiles?

Volcanic Fissure projectiles should be able to multi-hit a target in the same way Molten Strike does. Try using "Concentrated Effect Support" to lessen the AOE and travel distance the projectiles have.

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And damage increases for melee hits like "Endurance charges on Melee Stun Support" affects those projectiles?

I believe a majority of the damage from Volcanic Fissure comes from the projectiles and not the initial melee hit itself. Regardless, anything that effects melee gem tags shouldn't effect projectiles unless another mechanic is involved (i.e. "Iron Grip" will add your strength bonus to the projectiles).

Thanks!