Lithomantic Barrage

• WWizards of the Coast2023-04-14
  Official Ruling
  “This spell can’t be countered” means it can’t be countered even by the ward keyword ability. If you cast Lithomantic Barrage targeting a creature or planeswalker with ward, you may still pay the ward cost if you want to, but Lithomantic Barrage won’t be countered if you don’t.
• WWizards of the Coast2023-04-14
  Official Ruling
  Spells and abilities that counter spells can still target Lithomantic Barrage. Such a spell or ability won’t counter Lithomantic Barrage, but any additional effects of that spell or ability will still happen.

Rulings via Scryfall