Oversized: You can use weapons of your size or one size larger than you as if they were your size.
而关于武器尺寸：
Large, Huge, and Gargantuan creatures use
weapons that are specially sized for them. Each size
category larger than Medium increases the weapon’s
damage die by one size.
One-Handed
1d4 ➛ 1d6 ➛ 1d8 ➛ 1d10 ➛ 1d12 ➛ 2d6 ➛ 2d8 ➛ 2d10
Two-Handed
1d8 ➛ 2d4 ➛ 1d10 ➛ 1d12 ➛ 2d6 ➛ 2d8 ➛ 2d10
Thus, a longsword sized for a Large fire giant deals
1d10 weapon damage instead of 1d8, and a Large
quarterstaff deals 2d4 weapon damage.
Large creatures can use two-handed weapons
intended for creatures one size category smaller than
themselves and treat them as one-handed weapons. A
fire giant (Large) can use a human’s greatsword with
one hand, and a fire titan (Huge) can use a fire giant’s
greatsword with one hand. A creature can’t use an
undersized one-handed weapon at all; its hand is too
large to effectively hold the weapon’s small grip.
Creatures can’t use weapons designed for creatures
larger than themselves. A human can’t fit his
or her hands properly around the hilt of a fire giant’s
dagger, let alone use it as an effective weapon.
When a creature that has a natural reach uses a
reach weapon, the weapon increases the creature’s
natural reach by 1 square.
那一只bugbear或牛头可不可以单手拿一把中体型的巨剑，大砍刀，长戟呢？
