Crystal Shards (Moderate)Weapon 4
Source Pathfinder Advanced Player's Guide
Damage 2d4 Piercing (plus 4 splash damage)
Type Martial
Range 20 feet
Price 16 gp
Weight light
Usage held in 1 hand
Activate 
Strike
This flask holds a pressurized red-brown gas flecked with bits of sublimated crystal. You gain a +1 item bonus to attack rolls. When the bomb explodes, it deals 2d4 piercing damage and 4 piercing splash damage as the mixture suddenly turns into solid crystals flying at high speeds.
Surfaces in the splash area grow brittle, gleaming red crystals that crumble to dust after 1 minute. The crystals on level surfaces are Caltrops. The crystals on vertical surfaces can be used briefly as handholds, granting the listed item bonus to the next Athletics check to Climb each space. The crystals in each space crumble after the creature leaves, whether Climbing or moving through the caltrops.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AlchemicalAlchemical items are powered by reactions of alchemical reagents. Alchemical items aren't magical and don't radiate a magical aura.
BombAn alchemical bomb combines volatile alchemical components that explode when the bomb hits a creature or object. Most alchemical bombs deal damage, though some produce other effects.
ConsumableAn item with this trait can be used only once. Unless stated otherwise, it's destroyed after activation. Consumable items include alchemical items and magical consumables such as scrolls and talismans. When a character creates consumable items, they can make them in batches of four.
EarthEffects with the earth trait either manipulate or conjure earth. Those that manipulate earth have no effect in an area without earth. Creatures with this trait consist primarily of earth or have a magical connection to that element.
SplashWhen you use a thrown weapon with the splash trait, you don't add your Strength modifier to the damage roll. If an attack with a splash weapon fails, succeeds, or critically succeeds, all creatures within 5 feet of the target (including the target) take the listed splash damage. On a failure (but not a critical failure), the target of the attack still takes the splash damage. Add splash damage together with the initial damage against the target before applying the target's weaknesses or resistances. You don't multiply splash damage on a critical hit.