There is a Legacy version
here.
Orc Necksplitter
Uncommon Forceful Orc Sweep Source Player Core pg. 279 2.0Price 2 gp;
Damage 1d8 S;
Bulk 1
Hands 1
Type Melee;
Category Advanced;
Group Axe
This single-bladed bearded axe has a jagged blade that's perfect for separating bone from tendon and cartilage.
Traits
Uncommon: Something of uncommon rarity requires special training or comes from a particular culture or part of the world. Some character choices give access to uncommon options, and the GM can choose to allow access for anyone. Less is known about uncommon creatures than common creatures. They typically can't be summoned. The DC of Recall Knowledge checks related to these creature is increased by 2.
Forceful: This weapon becomes more dangerous as you build momentum. When you attack with it more than once on your turn, the second attack gains a circumstance bonus to damage equal to the number of weapon damage dice, and each later attack gains a circumstance bonus to damage equal to double the number of damage dice.
Orc: A creature with this trait is a member of the orc ancestry. These green-skinned people tend to have darkvision. An ability with this trait can be used or selected only by orcs. An item with this trait is created and used by orcs.
Sweep: This weapon makes wide swinging attacks. When you attack with this weapon, you gain a +1 circumstance bonus to your attack roll if you already attempted to attack a different target this turn using this weapon.
Critical Specialization Effects
Source Core Rulebook pg. 283 4.0Certain feats, class features, weapon runes, and other effects can grant you additional benefits when you make a Strike with certain weapons and get a critical success. This is called a critical specialization effect. The exact effect depends on which weapon group your weapon belongs to, as listed below. You can always decide not to add the critical specialization effect of your weapon.
Axe: Choose one creature adjacent to the initial target and within reach. If its AC is lower than your attack roll result for the critical hit, you deal damage to that creature equal to the result of the weapon damage die you rolled (including extra dice for its
striking rune, if any). This amount isn't doubled, and no bonuses or other additional dice apply to this damage.