What is 4E Luck specifically *not* allowed to affect?

[aesir23]

Originally Posted by Bruno

(or use a social skill and use Luck on it to roll well, or use Wishing to get the other guy to fail his will roll to resist)

Good point. Objection withdrawn.

[Þorkell]

You can't use Luck on the defense roll of your opponent.

[vicky_molokh]

Originally Posted by Figleaf23

Is that in one of the rule books?

If not, Kromm can't just ban it in a forum post.

He can. And he will send MIBs after you if you don't comply, even if you don't know the new ruling.

Seriously, authors' posts of that sort typically should be taken as either 'this is how I envision it' or 'this is how I think best/doubleplusfun gaming can be achieved easiest'. That sort of thing. It's not like we have GURPS Official Tournaments of Death.

[aesir23]

Originally Posted by Þorkell

You can't use Luck on the defense roll of your opponent.

You can with Wishing.

[Kromm]

The only rules "forbidding" Luck on rolls by or for the character that I know of are on p. 12 of Magic:

Ceremonial magic may not be assisted with Wishes, Luck, or Bless spells.

and on p. 30 of Thaumatology:

The various Luck advantages can normally only affect success, damage, and reaction rolls. They can't influence rolls on "effects tables" such as the Firearm Malfunction Table (p. B407), the Gadget Bugs Table (p. B476), or any critical success or failure table.

Note that the latter case specifically identifies the Reaction Table as different from an "effects table." Also, if you're worried about a critical failure, you can still finesse the situation by rerolling whatever caused it, before rolling on the table.

You're also forbidden from using Luck on others' rolls (without special enhancements like Wishing), with the sole exception of rolls made to hit you in combat. However, that is a special exception. Others' rolls are generally none of your business, even if you have Luck.

[PK]

Originally Posted by Figleaf23

Kromm can't just ban it in a forum post.

Clearly, you underestimate the power of Dr. Kromm . . .

[Kromm]

Originally Posted by Rev. Pee Kitty

Clearly, you underestimate the power of Dr. Kromm . . .

Well, that and the fact that I'm only paid to post here as part of ongoing support for the game. It's living canon.

[Tinman]

Originally Posted by Þorkell

You can't use Luck on the defense roll of your opponent.

Wait... Why not?

[NineDaysDead]

Originally Posted by Kromm

The only rules "forbidding" Luck on rolls by or for the character that I know of are on p. 12 of Magic:

Ceremonial magic may not be assisted with Wishes, Luck, or Bless spells.

and on p. 30 of Thaumatology:

The various Luck advantages can normally only affect success, damage, and reaction rolls. They can't influence rolls on "effects tables" such as the Firearm Malfunction Table (p. B407), the Gadget Bugs Table (p. B476), or any critical success or failure table.

Note that the latter case specifically identifies the Reaction Table as different from an "effects table." Also, if you're worried about a critical failure, you can still finesse the situation by rerolling whatever caused it, before rolling on the table.

You're also forbidden from using Luck on others' rolls (without special enhancements like Wishing), with the sole exception of rolls made to hit you in combat. However, that is a special exception. Others' rolls are generally none of your business, even if you have Luck.

Originally Posted by Lucki

Your Luck only applies to your own success, damage, or reaction rolls, or on outside events that affect you or your whole party, or when you are being attacked (in which case you may make the attacker roll three times and take the worst roll!).

What is "outside events" meant to cover?

[aesir23]

Originally Posted by Tinman

Wait... Why not?

Because default Luck is about being personally lucky, not about making other people unlucky.

Unless you take Wishing. Then all bets are off.