The remotely triggered Castanas quietly deliver a lethal dose of electricity to unsuspecting enemies.
The Castanas are a throwing type secondary weapons with an electrical detonation charge that can be detonated remotely by using the secondary fire, much like the Penta. Although lacking in throwing speed like other thrown weapons, they can be stacked up to six then detonated all at once to create a wide array of crowd controlling opportunities, thanks to their electrical explosion and chaining effects.
User can detonate charges on command, giving the player precise timing in detonation.
Up to six charges can be ready for detonation at the same time.
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.
Equipping with the Ogris, Torid, or Penta will increase their overall ammo capacity.
When Magnum Force is added, the Castanas will begin to spread apart on throws if Multishot mods are applied. This may be helpful for combating the small blast radius they have by spacing them slightly apart from each other.
The Castanas are currently subject to a bug that dramatically increases projectile spread when using multishot mods. Equipping a low-rank Magnum Force will fix this.
Throwing these at an Arctic Eximus snowglobe and detonating them will kill the Eximus.
Castanas thrown by Mirage's illusions from Hall of Mirrors will not interfere with the maximum amount of armed Castanas at a given time.
Caution should be taken when this weapon possesses elemental damages such as Magnetic, Toxin and Viral, as these would deliver their corresponding negative effects should the user be caught in the blast area.
As a Nyx, throwing several Castanas to the floor, casting Absorb on top of them and detonating them makes a good (and fast) combo for an instantly "charged" Absorb with the right build.
Mirage's Hall of Mirrors can be used to increase the number of Castanas that can be planted, but the holograms' Castanas will detonate a few seconds after impact; though they will not damage the player and can still also be detonated manually in the given time they are active.
If you are willing to take the damage, you can detonate the Castanas right on top of yourself by pressing the fire and secondary fire keys at the same time. This technique is useful for Link + Blessing Combo.
Note that as of Update 13.3, the Link + Blessing Combo is less effective, due to the fact that Blessing doesn't confer invulnerability any longer.