D&D 3.5 Main FAQ
The description of the flurry of blows ability says
there’s no such thing as a monk attacking with an off-hand
weapon during a flurry of blows. What does that mean,
exactly? Can the monk make off-hand attacks in addition to
flurry attacks?
Actually, the text to which you refer appears in the entry
for unarmed strikes. When a monk uses his unarmed strike
D&D FAQ v.3.5 5 Update Version: 05/21/04
ability, she does not suffer any penalty for an off-hand attack,
even when she has her hands full and is attacking with knees
and elbows, using the flurry of blows ability to make extra
attacks, or both.
The rules don’t come right out and say that a monk can’t
use an unarmed strike for an off-hand strike (although the exact
wording of the unarmed strike ability suggests otherwise), and
no compelling reason why a monk could not do so exists.
When using an unarmed strike as an off-hand attack, the monk
suffers all the usual attack penalties from two-weapon fighting
(see Table 8–10 in the Player’s Handbook) and the monk adds
only half her Strength bonus (if any) to damage if the off-hand
unarmed strike hits.
To add an off-hand attack to a flurry of blows, stack
whatever two-weapon penalty the monk has with the penalty (if
any) from the flurry. Attacks from the flurry have the monk’s
full damage bonus from Strength, but the off-hand attack gains
only half Strength bonus to damage. If the off-hand attack is a
weapon, that weapon isn’t available for use in the flurry (if it
can be used in a flurry at all, see the previous question). For
example, a 4th-level monk with the Two-Weapon Fighting feat
and a Strength score of 14 decides to use a flurry of blows and
decides to throw in an off-hand attack as well. The monk has a
base attack bonus of +3 and a +2 Strength bonus. With a flurry,
the character can make two attacks, each at +3 (base +3, –2
flurry, +2 Strength). An unarmed strike is a light weapon, so
the monk suffers an additional –2 penalty for both the flurry
and the off-hand attack, and the monk makes three attacks,
each at an attack bonus of +1. The two attacks from the flurry
are primary attacks and add the monk’s full Strength bonus to
damage of +2. The single off-hand attack adds half the monk’s
Strength bonus to damage (+1).
If the monk in our example has two sais to use with the
flurry, plus the off-hand attack, she can use both in the flurry
(in which case she must make the off-hand attack with an
unarmed strike) or one sai for the off-hand attack and one with
the flurry. The sai used in the off-hand attack is not available
for the flurry and vice versa.
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