So this is an idea for SIVA enemies. Not like the fallen in destiny 1. This is more inspired by the Iron Lords. With how SIVA used their armor. This is a similar idea with SIVA using armor and parts from Enemies.

I had this idea before the Dread, and now seeing them inspired me to make them even more unique with abilities.

Engineers- Engineers are a medium sized enemy. The SIVA of Engineers has taken over fallen wretches armor.

They still wield their glaives but they are now a deep red instead of blue. And instead of charging at you they stay away and shoot projectiles out of the glaive.When at critical health they dissipate and reform at a further distance.

The Constructs- Constructs are Vex Harpies that are being held together by SIVA. These harpies utilize their sivafied tentacles to give gaurdians a challenge.

Constructs harden the SIVA in between their tentacles to create a shield for allies behind them. Enemies can shoot through this shield but gaurdians can not.

In order for the Contrust to drop the shield you must destroy the center Eye.

Wreckers- Wreckers wear hive knight armor and are aggressive fighters. They approach gaurdians with Swords and shields in hand. When breaking a wrecker's shield they become Enraged and release a swarm of SIVA projectiles that damages gaurdians over time.

Safegaurds- Safeguards are large strong enemies that utilize Cabal Incindeor Armor. These strong enemies have regular weaponry but are able to fire clusters of SIVA nanites from their back tanks.

These SIVA clusters track Gaurdians and explode when in close proximity. Be careful as for when one damages you. Your are slowed down for a brief moment.

These Safeguards also contain a other ability. These SIVA clusters when fully missed transform into another enemy.

Watchers- Watchers can naturally spawn in the SIVA forces. But Safeguards can create them. Watchers are small SIVA clusters that have taken a form similar to vex detain frames.

Watchers fly around the battlefield and fly towards gaurdians to attack. When a Watcher gets close they detonate and deal damage to gaurdians while simultaneously alerting all other enemies to your location.

Architects- Architects utilize vex hobgoblin armor to stay in the battlefield. These enemies fire off lasers from a distance and create additional dangers.

Architects create SIVA Superstructures that create a field of energy that grants shields to all enemies inside of it. Destroy the Superstructures to remove the shields.

Assemblers- Assemblers are a horde of SIVA nanites that slowly combine together. Destroy each individual bundle before they combine together fully. If they manage to combine they transform into an Exterminator

Exterminator- Exterminators are the result of Assemblers creating their own weapon with SIVA. Exterminators closely resemble brigs. but have new abilities.

Exterminators have arm cannons that shoot clusters of nanites. They also possess back Cannons that fire off SIVA cages.

These cages start off as intangible but if not destroyed solidfy and trap you inside before slowly closing, crushing you in the process.

Additionally when an Exterminator is damaged it will fly and shoot much larger cages that trap you in with other enemies.