Protector Sentinel (Trove)

Protector Sentinels are Forerunner machines similar in design and purpose to Sentinels.

Overview
Protector Sentinels are smaller, faster, and occupy less of the population limit, although weaker in terms of firepower. In direct combat, they are less effective than Sentinels. It is in the support role that they excel - their Y-button ability is to attach themselves to one of the player's other units, following it in action. Only one can be attached to a single unit one time, however appointing one to a spartan and a vehicle and having that spartan then enter the vehicle will give that vehicle 2 protectors. This only works when it is your vehicle, when you jack an enemies vehicle the protector is destroyed.

For the most part, they must be summoned from Protector Factories. However, upgrading the Prophet of Regret with Ancestral Perversion will equip him with two of these guardians for his personal protection. Similar to the Sentinel Majors, they are equipped with onboard beam weapons which fires a single blue coloured pulse beam at a time. They are of similar size and shape to the Constructor but slightly bigger. It has several laser guidance systems that scan for any threats.

Variations
There are three different variants of the Protector Sentinels:
 * Offensive Protector - when attached, it attacks units near its host with a pulse of laser fire.
 * Shield Protector - projects a rechargeable energy shield around its host unit.
 * Healing Protector - recharges its host's health when out of combat.