Mana Veil in Clover Retribution is a defensive mana skill that lets you block or absorb incoming magical damage, acting like a protection layer for you. In the game’s spell/trait ecosystem, mana-related abilities also include things like Mana Block, which fully blocks magic, so Mana Veil is generally used as a survivability tool rather than pure offense.

What it does

  • It protects you from enemy spell damage.
  • It helps you stay alive during fights or when getting rushed.
  • It’s best used when you expect burst damage or want to buy time to escape.

Practical use

  • Pop it before entering a fight if you think a magic combo is coming.
  • Use it while repositioning or healing.
  • Pair it with other defensive or mobility skills to survive longer.

Note

I couldn’t verify a more exact in-game stat breakdown from the available sources, so this is the safest description based on current public info.

TL;DR: Mana Veil is basically a magic defense skill that helps block or reduce incoming spell damage, making it useful for survival.