We have no meanings for "annihilate so" in our records yet.
1 Why should I hesitate a moment to annihilate so powerful a cause of error and guilt?
2 If I am wrong, the sooner I am knocked on the head and annihilated so much the better.
3 The work which men, and years, and glowing knowledge, had slowly raised up, all dead, all annihilated so suddenly.
4 It was his command that destroyed three of the massive orbital cannons that had annihilated so many other Covenant ships.
5 A fresh-water fauna gave place to a marine one, and the former was annihilated so far as that area was concerned.
Grammar, pronunciation and more