The projectile creates a toxin cloud on whatever surface it hits, this is purely cosmetic and does no additional damage, staying for less than a second.
The most effective ways to use the Embolist to get rid of enemies is via a collapsed Bastille or Larva , as the abilities set it up to hit the entire group at once, as long as Punch Through is added.
Be sure to convert the Toxin damage to another type when fighting Infested as the damage will be reduced on these enemies.
The same reduction applies when fighting Robotics but changing damage type should be balanced against the fact that such enemies typically have allies using Shields, against which Toxin is the best damage type.
As the Embolist is primarily a close range weapon that benefits from area of effect, Magnum Force can be beneficial in increasing both its damage and its spread.
Ruinous Extension will increase the range of the weapon by almost double (from a max range of 9m to 17m).
An embolism refers to the lodging of an embolus, such as a blood clot or gas bubble. It can cause a circulatory blockage which affects a different part of the body away from the actual site of the blockage.
The visual effect of the Embolist resembles the special attack of the Nauseous Crawler, indicating that this weapon may be a part of said Infested or derived from it. However, apart from the similar attack appearance there are no shared properties.
The 'tail' on this weapon moves.
Interestingly, the weapon's reload animation seems to involve pulling (or possibly twisting) the weapon's tail.
When given to a Rescue target, the cloud released when fired will be the Embolist's default energy color, as opposed to the customized one shown on the weapon itself.
Embolist in the Codex.
Lets Max (Warframe) E31 - Embolist and Eroding Blight
WARFRAME EMBOLIST Advanced Guide
New Embolist Reload Animation
Warframe - All Infested Weapons - Animations & Sounds w Slow Motion
Warframe - All Infested Weapon Reloads in 30 seconds (2013 - 2019)