Unexplained elements

Does not include missing information about the interface, game options, or similar.

Vague explanations or descriptions can often be completely useless in determining what they actually do. Especially if that thing is not mentioned anywhere else. Worst cases are the ones where you can't even reliably determine it by observing.

As an example, flamer tower in Sentinel 3 has an ability labelled as "chemical fire" and the only observable effect this has is that the flame is colored differently. No explanation or description for it is given besides the name.