Q48: Would characters or other critters riding some sort flying contraption, such as an airship or flying carpet, still be affected by the Tarrasque's aura at all? What about a cloud chariot or other conjuration?
A48: No, they wouldn't be affected by the reduced fly speed or reduced altitude, (as only creatures are affected, and they're not the ones with the fly speed and max altitude) but yes, they would be affected by the latter part of the aura's text.
Text:
EarthbindingAny creature above this altitude at the end of its turn falls to an altitude of 20 feet automatically.
As you can see, you'll fall somehow. It doesn't exactly tell you the interaction between this and flying things, but I would think it would cause a great amount of force on the creatures until they are within 20 feet, which may or may not move the flying object being used, but will definitely keep them pinned to the ground. Of course, you may rule that if they have something keeping them from falling (keeping them basically flying) then it doesn't apply.
Q49: Considering Shuriken are sold in bundles of 5 and are "thrown only" weapons, would the price for a magic weapon apply to only one Shuriken or to sets of five?
A49: One. Magic enhancements are now all per weapon, and they made throwing weapons return to you. No more abuse using magic enhancements that aren't related to the weapon's effectiveness/longevity in use on ammunition.
Q50: Concerning the Mad Wraith's (MM 266) touch of chaos ability, is it considered forced movement when the target moves to attack?
A50: No. Forced Movement is only push, pull, and slide, and also other things would prevent it from being forced movement anyway.
Relevant text: (underlined is important text)
[size=+1]Pull, Push, and Slide[/size]
Certain powers and effects allow you to pull, push, or slide a target.
PULL, PUSH, AND SLIDE
? Pull: When you pull a creature, each square you move it must bring it nearer to you.
? Push: When you push a creature, each square you move it must place it farther away from you.
? Slide:
FORCED MOVEMENT
? Line of Effect: You must have line of effect to any square you pull, push, or slide a creature into.
? Distance in Squares: Specific Destination:No Opportunity Attacks: Forced movement does not provoke opportunity attacks or other opportunity actions.
? Ignore Difficult Terrain:Not a Move:
The movement that the target takes would provoke OAs and be affected by difficult terrain. Notice that while it never explicitly states that it's only push, pull, and slide, it heavily implies it with the text preceding the forced movement list and the line of effect bullet in said list.
Q51: Swordmage's Frost Backlash is an Immediate Interrupt that triggers on hit - does that mean if the attack kills the originator of the attack, the attack never occurs, or just the damage never happens. I believe the answer is yes, but I just want clarification.
The attack never occurs because Frost Backlash happens first, and if the attacker is dead then they can't attack.
But the power would still be expended. (I believe, it never explains well what happens when your action is interrupted)