Tryant's

GALACTUS' FIRST CREATION: When Tyrant is dealt damage, roll a d6. On a result of 1-3, he can use Invincible, on a result of 4-6, he ignores all damage dealt.

Can you use PC on Tryant's Defense ability?

Technically yes, but you will have a very hard time doing so.

Remember you can only use standard Probability Control on rolls made by your figures on your turn. Normally Tyrant's power will only trigger on your opponent's turn so you will not be able to use standard Probability Control on it, just like Shape Change, Super Senses, Impervious, etc...

You can use probability control on any roll made by the active player, unless the effect granting the roll says otherwise.

If you are rolling for Tyrant during your turn, you would be able to use probability control.

Normally, you are going to be using it during your opponent's turn.

You could use it if he was caught in a friendly fire incident like being in a crowd of opposing figures that got hit by friendly EE.

I'm guessing the question was asking if you could PC Tyrant's roll if you are the opponent, which you can't, right?

Any player can PC the roll, as long as it is a roll happening during the turn of the player controlling Tyrant.

Let's say Tyrant is adjacent to an opposing character, A. A is adjacent to B, C, and D, all of whom are opposing.

The player who has Tyrant also has I.S.A.A.C. Tyrant's player doesn't want to miss an opportunity to dish out lots of damage and I.S.A.A.C. has line of fire on A. So he targets A with a ranged combat action and chooses to activate Energy Explosion. He rolls an 11, which is enough to hit Tyrant, A, B, C, and D.

So A is dealt 3 damage, and all characters adjacent to A are also dealt 3 damage, including Tyrant. Tyrant would get to roll for his power. Since it is the active turn of the player controlling Tyrant, any player could use probability control on that roll.

Buuuut do not forget the sneaky new SR Rocket Raccoon That little guy has "probability control" that forces the re-roll of any roll within range and line of fire.

But nowhere in that power does it say it is Probability Control. It has a game effect that acts very similar, but it not Probability Control.

Which is why I live to give him Adara for PC on top of his power