Has base damage type of Electricity, allowing Castanas to easily be modified to Radiation damage for Heavy Grineer units, Corrosive damage for Ancient Infested units and Magnetic damage for Corpus units.
The Sancti Castanas can be acquired by reaching the Rank of Flawless with New Loka, and spending 100,000 Standing to purchase. As with all Syndicate Weapons, the Sancti Castanas cannot be chosen as the free offering upon ranking up to Flawless rank.
The Sancti Castanas has an innate Purity effect identical to that found in New LokaWeapon Augment Mods. Upon accumulating sufficient affinity, the Sancti Castanas will release an AoE radial blast that deals Corrosive damage and proc, restores 25% of the Warframe's maximum Health, and temporarily buffs maximum Health by 25% for 30 seconds.
These are the ONLY weapons in the entire game that innately come with 3 polarities installed (Two x20px and one x20px), making modding extremely easy.
In this case, the x20px polarity is very easy to use, as two x20px polarities means that it will deal a lot of raw AND elemental damage after modding, meaning that mods that use the polarity like Deep Freeze is very efficient.