New Weapon Proficiencies (CSH)

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You know about weapon proficiencies from Chapter 5 of the Player's Handbook. Here, we'll talk about some additional, special things you can do in a campaign with weapon proficiencies.
==Ambidexterity==
1 slot
Ambidexterity is a special weapon proficiency that allows a character to fight equally well with both hands. A character without this weapon proficiency who uses a weapon in his off-hand suffers a -2 on attack rolls. A character with this proficiency will also be equally adept at performing noncombat tasks with both hands.
The ambidexterity proficiency doesn't give a character two attacks per round. It just means that if he loses the use of one hand, or drops the weapon in that hand, he's equally adept with the other hand.
If the character does try to fight with two hands (see the Player's Handbook, Chapter 9, "Attacking with Two Weapons"), he suffers a -1 penalty on the first attack roll and a -3 on the second roll.
==Large Weapons==
As explained in Chapter 3 of the Concordance of Arcane Space (see "Weapon Teams"), shipbome weapons can be used more effectively by weapon specialists. While the Concordance explains how to hire a large-weapon specialist, it does not explain how PCs can themselves become such specialists.
A character can expend weapon proficiency slots to become expert with one type of large weapon. There are five basic types, each with its own proficiency slot cost, as shown in the following table.
 Table 10: Large Weapon Proficiency Costs
Weapon Type 	Cost in Slots	Groundling
Ballista 	1 	Yes
Bombard 	2 	No
Catapult 	1 	Yes
Greek Fire Projector	2 	No
Jettison 	1 	No
The Groundling column in the table indicates whether the weapon proficiency is available as a proficiency to characters before they enter space. Weapons marked "No" in the Groundling column are not used on planetary surfaces, so a character who has never been to space cannot be proficient in their use.
Proficiency in a class of weapons gives proficiency in all weapons of that type. Thus, proficiency in catapults includes light, medium, and heavy catapults; proficiency in ballista includes light, medium, and heavy ballistae as well as gnomish sweepers.