The Siege of Cradlecrush [Quest]

Text of the Quest:

Aspera and the giants are ready to begin the siege of Cradlecrush. Using the documents I recovered from the Stormfist scouts, they formulated a plan of battle.

Aspera Giant-Friend: Are you ready to begin the siege of Cradlecrush?
Hero: Let's do it.
Aspera Giant-Friend: The notes you discovered suggest two weaknesses in the fort's defenses—the gates and the captive mammoths. Once you get inside, you must free the mammoths to cause havoc and unlock the gates to let us in.
Hero: Then what?
Aspera Giant-Friend: Warlord Lob and his lieutenants have made the arena at the heart of Cradlecrush their headquarters. Use the horn there to sound our attack and strike fear into the invaders' hearts!
Hero: Free the mammoths, open the gates, and blow the horn. I'm on it.
Aspera Giant-Friend: The giant near the natural wall, just behind me to the west, is ready to help you. Just give him a poke and he'll do the rest. We'll launch our attack once you're inside and we hear the signal.
Hero: I want to ask you something before I go.
Aspera Giant-Friend: Leave that to my giant friend. He knows just how to get you inside the fort.
Hero: What will freeing the mammoths do?
Aspera Giant-Friend: One of the documents you recovered indicated that the mammoths are difficult to control. If you free a few of them, that should distract some of the Stormfist soldiers while we assault the walls.
Hero: How do I open the gates?
Hero: Any other advice before I do this?
Aspera Giant-Friend: You did well. Better than I or my master expected. Now, only one task remains.
Hero: And what task is that?
Aspera Giant-Friend: The warlord who leads these brigands, Lob the Cleaver. He's inside, along with the deadly Ores that are always at his side. They're a nasty piece of work, the lot of them. Enter the arena and sound the horn. That will tell the giants it's time.
Hero: Care to join me?
Aspera Giant-Friend: I think not. Such a path fits neither my role nor my disposition. I am a friend, not a foe. Besides, this is your mission. I wouldn't want to steal your glory. Blow the horn and the big folk will come. They'll help you.
Hero: How did you get here so fast?
Aspera Giant-Friend: It was easy enough to slip inside thanks to all the chaos you caused. I decided to wait for you here.
Hero: Will you go in there with me?
Aspera Giant-Friend: You don't get to know everything, mortal. Does that frustrate you? Just know that some grudges are ancient and some answers are beyond your understanding.
Hero: What if I refuse?
Aspera Giant-Friend: You would abandon this cause that you have worked so hard to advance? If that's what you wish, go. I won't stop you. But I think you'll be back. We all have a desire to see what happens next.

Aspera Giant-Friend: Welcome back, friend. You survived the challenge and helped the giants take back the stronghold. I couldn't have asked for a better resolution to this situation. Well done!
Hero: Lob the Cleaver is dead.
Aspera Giant-Friend: I know. I felt his life force depart when you struck him down. Go in peace, Giant-Friend. You have our thanks.
Hero: Complete Quest.