Penta

Penta is a Corpus Grenade launcher. It launches ballistic grenades with primary fire and detonates all active grenades with the Zoom feature.

Damage listed in game is damage from physical grenade impact with a target. The explosion is significantly more powerful.

Characteristics
Advantages :
 * Grenades deal Impact damage when hitting an enemy.
 * Deals 50% more damage to shields.
 * High AoE Damage.
 * 350 Blast damage that can be increased by mods.
 * A maxed Firestorm increases the blast radius up to 6.2 meters.
 * Very ammo efficient.
 * Heavy Caliber does not significantly reduce accuracy.
 * Explosion can also cause procs.
 * Less explosion damage results in less damage dealt to self in comparison to the Ogris. Although damage and elemental mods will apply full damage to the user.
 * If three shots proc multi-shot from Split Chamber, there will be 6 grenades. (Needs testing to see if all six deal damage. The extra projectiles are only noticeable if using Heavy Caliber at a high rank.)

Disadvantages :
 * Explosion deals Blast damage, which cannot be changed into another type.
 * Blast deals 25% less damage to Armor.
 * Impact damage of the grenade deals 25% less damage to flesh.
 * Can only have five grenades out at once.
 * When using the Split Chamber mod, the extra projectiles count towards the limit of five live grenades.
 * Grenades that have stopped moving have no obvious visual or audio cue (but with "PhysX" enabled they have some sparks when come to complete rest).
 * Grenades have slow projectile speed travel time and heavy arcing.
 * Grenades have a high bouncing capability which makes it hard to stack on desired spot.
 * Increasing magazine capacity does not allow you to have more than 5 grenades out at once, and after detonating the maximum of 5 at once you will have less to start in the magazine, forcing you to reload to shoot another 5.
 * Explosion cannot deal a critical hit (however the projectile can).
 * The explosion can damage the user. With high damage mods it is possible to down yourself in one shot if too close to the blast radius.
 * No polarities.

Weapon Loadouts
See the user build section for builds using this weapon.

Tips

 * Grenades fired from the Penta are lobbed in a heavy arc, allowing the player to kill enemies hiding behind cover much more easily, as the detonation happens upon external trigger.
 * Standing at a greater height allows for the grenades to be lobbed and bounce further, allowing the user to see the grenade better, as well as eliminating the worry of self-damage.
 * It is not recommended to use Shred as grenades can often go through the floor on some tilesets, making it impossible to bounce every time.
 * Split Chamber, under random circumstances, can fire a total of six grenades. Provided multishot works on every shot, 2 shots puts out 4 grenades, allowing you to fire a third for the 5 total limit, but with 1 extra from the multishot.
 * When using the Split Chamber in conjunction with Heavy Caliber, the decreased accuracy puts the grenades side-by-side and you can clearly see 6 total grenades out at once. This is most likely a bug due to split chamber forcing an additional grenade to spawn on the last shot.
 * Speed Trigger is an efficient way to quickly launch up to the grenade limit.
 * Elemental mods such as Cryo Rounds and Hellfire are external from the main Blast damage, allowing the weapon to have 3 separate elemental combinations. If one creates a Blast damage combination, it will merely add itself to the main explosion damage.
 * Be extra cautious and do not attempt to use in small areas. A single fully-modded grenade can usually kill any warframe unless protected in some way.
 * Players can detonate grenades in mid-air for an 'airburst' effect, which can deals headshot damage to targets below.
 * The Penta is a very effective weapon when firing from a safe location on an Infested mission.
 * The default color of the grenades can make it hard to see in the middle of a crowd of enemies or from their random bouncing. Change the energy color to suit certain tile sets (eg, do not use bright white for Corpus Outpost missions).
 * Be wary when installing Infected Clip or Malignant Force, as the Toxin damage from either mod can bypass Warframe shields and deal damage directly to health.

Trivia

 * Released in Update 11.3.0.
 * This is the first weapon to have the Zoom capability replaced with a different function.
 * Penta derives from the Greek prefix of "five", which makes sense as the grenade launcher utilises a magazine of 5 grenades.
 * This seems to be the first Corpus weapon to be named after Greek origin instead of Latin.
 * Penta is the third weapon model that has a magazine that responds after firing. First being the Twin Gremlins, and the second is the Soma.
 * Its model is known to be a non-static model, as the upper barrel shaft shifts when reloading.
 * It seems the entire gun represents a mere skeletal structure, unlike most Corpus weaponry.
 * Increasing the magazine size actually increases the visible grenades stored in the weapon, being the first weapon with this obvious visual ammunition increase.
 * With 5 grenades in the weapon, there is a small gap between the fifth grenade and the bottom of the gun. With 6 grenades, there is no gap at all. With 8, the stack actually exceeds the bottom.
 * The Penta is the first Corpus weapon to focus on explosive weaponry, utilizing the technology on Plasma grenades through a launch system. They, however, deal blast damage, which does not fit the Corpus theme.
 * The grenades are flat and rectangular, which is odd, considering their bouncy movement.
 * On the stats, it says the trigger is blank.

Bugs

 * Rarely a detonation will cause damage to you even if the grenade is well beyond the explosion radius. Attempts have been made to fix this issue, with varying degrees of success.
 * In its Arsenal UI, it does not display its trigger function, though it functions as Semi-Auto.
 * Occasionally, the flames emitted by the Penta can remain indefinitely if reloaded too frequently.