The best way to protect your Deadnauts is to equip them with shields. Shields can provide the following benefits:
Of course, you'll need to have defense ports on your suit and a spare passive slot, which limits who can carry shields. The answer is to equip one of your Deadnauts with a field, which will 'throw' a shield onto another Deadnaut, provided that Deadnaut is in range and in line-of-sight.
To project a field, select a Deadnaut with a field in their primary suit slot and then middle-click on another Deadnaut. Alternatively, hold down Control and left-click.
Shields and fields stack, meaning you can throw a field onto a Deadnaut who already has a shield for an extra bonus.
Note that fields use the suit's active power when activated.
Some threats will try and drag your Deadnauts away from the group, which can have a devastating effect. Any Deadnaut with a shield or field will never be dragged - you can also cast a field onto a Deadnaut to cancel a drag in progress.
In addition, you can also throw a field onto an enemy. This has several effects:
Although fields rely on timing and reflexes, they can be very powerful and are worth taking the time to master.
If a room's structural integrity drops below 10%, Deadnauts will start taking damage in that room. A shield or field will block all room damage of this type.
A repulsor is a special kind of protective item that also uses shield slots. However, instead of reducing damage, it releases a wave of energy that pushes threats backward. The smaller the threat, the further they'll be pushed back, and if you manage to send them into a wall, then they may also take a small amount of damager.
To use a repulsor, hold Control and aim in the direction you want to push, then left-click. Alternatively, hold and release the middle mouse button.