A Phazon Blocker (or Phaaze Blocker, as named in the internal data) is a Phazon obstruction encountered twice in Metroid Prime 3: Corruption, in Cargo Dock B on Norion and the Metroid Cavern on Phaaze. They form over Doors and are indestructible to Samus's weapons. The Blockers spawn scores of Hopping Metroids on Norion and Phazon Hoppers on Phaaze, glowing bright blue as they do so. Samus needs to kill 16 Hopping Metroids and 10 Hoppers. Once she does, the growth begins to sizzle and then explodes. Both times, three puddles of Liquid Phazon are left behind for Samus to either destroy or ignore; on Phaaze they include Phaz-Ing.
"Scans indicate a connection between nearby bioforms and this Phazon mass."