This is the second Omnibus of the Gotrex and Felix saga, i'll tell you a little bit anout each book in this Omnibus set.
Book 4: DRAGONSLAYER.
This is another action packed tale of the two heroes on their quest for both death and fame, here we see the troop of heroes coming back from their mission to the lost Dwarf keep only to find the army of the Scaven had captured their friend and allies keep, but this is not Gotrex and Felix's worst problem, while escaping the chaos waste they witness a gathering of chaos warriors ready to invade the world of men. Battling Scaven, Orcs, Chaos warriors and the might of an ancient dragon this book is an action packed thrill ride.
Book 5: BEASTSLAYER.
In this book we see Gotrex and Felix hold up in the massive fortress of Praag which is under siege by the massive army of Chaos warriors and their Beastmen allies. This book has everything you could ever what from an epic fantasy fiction, the action is none stop with plenty of battles, assassinations and political intrigue. If you liked Gemmell's Legend then you will love this book, so far the best of the Gotrex and Felix saga.
Book 6: VAMPIRESLAYER.
This book sees Gortrex and Felix survive the horrors of the siege of Praag only to find themselves fighting in the ruined city against the scavengers of the night and their dark magics, this book while good was not as good as the first two in the second Omnibus, like the first to books this is an action packed thrill ride, while I would only gives this book alone 4/5 and the two previous books 5/5, this is a great ending to the second and hopefully not final Gotrex and Felix Omnibus.
I hope the review was of some help to you.