The phrase "such magnitude" means that something is very big or significant, often describing a situation or event that has a great impact or importance. Full definition
What is so devastating about the loss of such a magnitude of life? (religion.blogs.cnn.com)
This is precisely why we need to carefully consider each other's ideas, especially on matters of such magnitude as the origins of the universe! (religion.blogs.cnn.com)
The forecasted 5 % to 10 % decline in average U.S. commercial real - estate prices would be the first of such magnitude for the $ 6.2 trillion market, absent a recession, in history. (morganstanley.com)