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.)
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 to close to the blast radius.
Using the Zoom button when Penta is in hand will detonate any grenades launched from the user.
Zoom is possible only when there are no existing grenades.
Detonations can still be triggered while the player is performing other actions.
Launching a grenade is silent to enemies, though explosions are noticeable.
Grenades have no arming delay, and can be detonated instantly with the use of the Zoom button.
Grenades can be bounced around corners, off walls, and over low obstacles.
Grenades that bounce into enemies deal damage even when bouncing off of other enemies.
The Arsenal UI used to label only the damage of the grenade on impact, but now labels the Impact damage of the projectile as well as the base Blast damage (350 base).
82.35% [350/(350+75)] of any elemental damage shown in the UI will be used for the AOE damage while the rest is for projectile damage.
Increasing the Magazine size of the weapon does not increase the 5 grenade limit you can have out.
The physical impact of the grenade can deal a critical hit but does not show up in the game's UI.
Though the grenade explosion does not destroy rockets from Bombards, impacts by the grenades from very accurate (or sometimes lucky) shots can.
When using Split Chamber, the second grenade is noticeable from the first (but only with Heavy Caliber at a reasonable rank), though they share the same trajectory and usually bounce the same direction too.
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.
Multiple impacts dealt by the same grenade are possible.
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).
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 composes 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.