A weak barrier can be erected at the start of the game by inserting a weak cell acquired from the supply table near the entrance into any of the inactive cell tiles surrounding the Guardian. After the rift has been opened, higher tiers of charged cells can be inserted in an empty cell tile to create a weak barrier as well, which are obtained by bringing uncharged cells through a portal to a runic altar.
When fully healed up, a weak barrier can boast a maximum of 50 Hitpoints, coupled with a Defence level of 20.
Weak barriers can be healed by placing charged cells in the corresponding weak cell tile, with higher tiers restoring a greater amount of Hitpoints. In case abyssal creatures break through the barrier, the broken cell tile left behind first has to be repaired with 12 guardian fragments before a weak barrier can be raised again.
^Jagex. Mod Ash's Twitter account. 23 September 2023. Archived from the original on 24 September 2023. Mod Ash: "[would you happen to know the defense of the 4 barrier tiers for gotr? and if they have any other stats i guess] Looks like 20, 40, 50, 70 to me. I didn't see other stats beyond the HP that you'd have known about."