Rondow Weapons
Summary
These are PVE weapons like Helion. However, they cannot be crafted. Their only source so far is via Lun Road Weapon Storage Box. This box drops from El Mar map. Both the box and the weapon are tradeable.
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Stats (Rondow vs Helion)
Let's look at a comparison of a Rondow and a Helion Weapon. In a nutshell, the Rondow Weapon is better than Helion version at all times this is because the base attack damage is higher. See below (8820~9111 magic attack damage vs 7608~7859).
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However, the Rank Option for Rondow weapons are at a wider range. For example, this Pierce has a Rank Option of 1904. This can be lower than 1000. This means that there are certain cases when Rondow weapons can be worse than their Helion versions. Generally, when the All Attack rank options are about 6000 in total, they are worth it to buy compared to Helion Weapons.
Rondow Weapons are Theos Grade and thus, can be upgraded until +15. They can be socketed and gemmed like regular weapons.