From Halopedia, the Halo wiki
The drop wall is a piece of equipment similar in operation to the deployable cover and drop shield. When deployed, the drop wall projects a large energy shield which protects its user from enemy fire in combat, while still permitting the user to shoot through it.
The drop wall is a usable piece of equipment in Halo Infinite. It can be deployed in combat to provide the player with a temporary shelter from enemy gunfire, and is capable of stopping both gunfire and grenades. Additionally, the player is still able to shoot through the deployed drop wall, at their enemies. However, it degrades easily under damage, so the respite it provides is temporary. Each section of the energy shield can only withstand a certain amount of damage from the outside before that section fails. Multiple sections can fail without the entire drop wall shutting down.
The drop wall underwent a redesign between the Halo Infinite Campaign Gameplay Premiere in July 2020 and the A New Generation trailer in June 2021. The shape of the energy shield was changed from a simple curved wall to be more concave with less sharp outer angles.
List of appearances