The Twisting Pattern Revealed

Tyndarios gains access to some special powers. Source is unknown, but it probably has to do with the Dark Flame, your heritage (not the Astartes part, but the other bit), and/or exposure to the Twisting Pattern of the Patron.

The Eye is Open (Base power): You do not suffer Corruption from Warp Shock (failed Fear checks caused by Daemons and other supernatural creatures of the Warp). You still suffer Corruption from other sources (such as eating Warp Stone or worshipping False Gods) normally. 

Note that Astartes are immune to normal Fear, but NOT supernatural Fear, so can suffer Warp Shock, so this can be somewhat useful. 

Also note that failing a Fear check doesn't necessarily have you running away - that only happens if you fail very badly 😈 

A marginal failure, for example, means you're a bit shaken, but not panicked. You would probably seek cover or try to avoid whatever is causing the fear, but beyond the roleplaying aspect of it, you don't actually suffer any penalties. A significant failure, however, would give you Disadvantage on everything while the source of the fear is nearby. A complete failure would send you running away, completely panicked. 

Fortunately, Astartes have rather high Defenses, so it would take some really bad rolls to fail that badly, even against supernatural horrors.

Twisting Strands of Fate (Tier 1): If you have 1 or more Edge remaining at the end of the session (or refresh point), you may temporarily increase your Edge by 1 for the next session. 

Additionally, if your current Edge is 0, you may "borrow" Edge from the next session. You may do this up to 3 times, but you cannot reduce your future Edge below 0 in this manner (relevant if you have only 1 or 2 Edge to begin with).