Erosion

• Name: Erosion (浸食)
• Effect: Pierces through enemies. Each hit deals a percentage of the target's current HP as bonus damage.
• Added: April 27, 2026 (Shadow Update)

A Shadow Update percent-HP + pierce specialist. Damage scales with the target's current HP, so it shreds tanks and bosses while underperforming on chaff.

The pierce keeps it efficient on layered enemy formations — front-row hits don't waste the shot.

Pair with conventional AoE/burst balls if your level mix is trash-heavy; on its own it's a single-target boss-killer.

• Physicist — pierce-friendly ball physics maximize multi-target hits
• Tunneller — pierce + screen-wrap re-hits the same target
• Sisyphus — radius doesn't matter, but the 4× damage multiplier still applies to the % calc
• Crit passives — outsized damage on tanky targets

• Erosion + Pierce → wider piercing line
• Erosion + High-damage → higher base for percentage calc

• Save for bosses and elite waves
• Stack with AoE balls for trash phases
• Pierce makes it free value when enemies are stacked in lanes