Leveling and Scaling Tips:
As you level, prioritize cast speed, mana regen, and intelligence to get the most out of this combo.
Upgrade your Spark to 20% quality as soon as possible for Path of exile currency extra projectiles, which translates directly into more fire damage from the Flame Wall.
Downsides to Watch Out For:
Mana Management: The combo can be costly on mana, so managing your mana pool and mana regeneration is critical. Consider using gems like Inspiration or Arcane Surge to offset this.

Flame Wall Placement: Since Flame Wall is a ground-based skill, you need to be strategic about where you place it. Keep it in areas where Spark can easily pass through, but also make sure you’re not getting surrounded or Path of exile currency for sale caught in dangerous positions.

Final Thoughts:
The Spark & Flame Wall combo is a powerful way to scale both fire and lightning damage. With the right support gems and gear, it allows for massive AoE clear while still maintaining high single-target damage. The synergy between Spark’s projectiles and Flame Wall’s fire damage is extremely efficient, and with scaling options through cast speed, mana regeneration, and projectile speed, this combo can easily carry you into endgame content in Path of Exile 2.