Create a new rule titled “Container Fields”, which reads:

Each DDA Member is equipped with an advanced energy field device known as a “Dimensional Rift Container” (abbr. DRC) as well as a number of energy cells that are required to operate it.
Each DDA Member shall track the amount of energy cells e owns in the GNDT, under a column named “Energy”, whose value must always be a positive integer (or zero), and may never exceed 30 (if it would exceed 30, it is set to 30 instead).

Create a sub-rule to rule “Container Fields” named “Energy Restock”, which reads:

Once per week, a DDA Member may “Restock” by increasing er energy cells by 10 and including the word “Restock” in er GNDT comment where e increases er cells.

The idea is that we can use this to stop the things that come from the Portal, but they should not be used as currency (hence the 30 limit) or as hit-points (hence the high restock ratio) and more like a strategic resource that we can spend to have success on a mission or something like that. The high restock rate also means we can have plenty of action in a single week.