Board Thread:Questions and Answers/@comment-30488984-20180630192929/@comment-32600226-20180702032426

I think it all depends on the Astartes and Daemons in question. While I think Daemons are more powerful than many portray them (especially Khorne's) so are Astartes. On the Vsbattles wiki a user made a |ist of Astartes feats that include, lifting a 14 ton drop pod, reacting to point blank bolts, get up after being run over by a Land Raider, and even more absurd feats. Even taking that with a grain of salt, the author does quote his sources, so while Daemons are no laughing matter, neither are Astartes. However if it came down to a one on one melee fight between a bloodletter and a Astartes, unless that Astartes is especially good against Daemons (like a Librarian or Grey Knight) the Bloodletter would probably win.

On the note of the Grey Knights being able to show up on time to help with Daemon invasions, I recall that they use specilized Libarians who can predict invasions as well as having extra fast ships. How much of all this is still canon is anyones guess however.