(from the Book of Roguish Luck)
Using Luck Points
A character can spend luck points to improve an attack roll, a skill check, or a saving throw. Luck points cannot be used to reroll damage rolls, hit point rolls, ability checks, caster level checks, or percentile rolls.
Lucky Attack and Lucky Skill Checks
A character can use luck points to reroll attack rolls and skill checks. When an attack roll or skill check has failed, a player may declare that roll unlucky after the fact and announce that she is making a lucky roll. The character spends 1 luck point from her pool to reroll the original d20 roll. A luck reroll can only be made once for each attack roll or skill check, unless the character has the A Step Ahead feat.
Lucky Saving Throws
Lucky saving throws are similar to lucky attacks and lucky skill checks, but it costs 2 points to reroll a failed save. The character is stuck with the result of the second roll, whether it succeeds or not.
Magic and Luck
Sorcerers, wizards, arcane engineers, and other arcane casters can use luck to reduce or avoid the chance of arcane spell failure when casting a spell. To do so, such a character spends 1 luck point for every 5 percent chance of spell failure she wishes to offset. If this expenditure of luck brings the arcane spell failure chance to 0 percent, she need make no arcane spell failure roll.
Regaining Luck Points
A character accrues luck points by gaining a level, from the effects of certain spells or Luck Feats, and sometimes when granted as part of an adventurer's award. Luck is a fairly rare quantity in the universe. Be careful how you spend it.
Players may earn luck points for good play. A player who makes the group laugh (or gasp), a player who delivers a line with gusto, or a player who steps up to a big confrontation may earn a luck point for doing so. Lucky style points are awarded immediately and can be used immediately.
Impressing the Group: If everyone at the table goes "Oooooh" at what a character just did or said, it is probably worth a point.
No character may exceed her maximum luck. Maximum luck is always equal to the total result of all Luck Dice the character has rolled, just as maximum hit points are always equal to the total result of all Hit Dice the character has rolled.
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