Katakana ダメ to end a sentence - emphasis?


In the following sentence (from the Legend of Zelda guidebook I am
translating) this sentence appears when talking about fighting enemies. My
question is about the purpose of ダメ at the end.

> 全ての敵を倒す必要はないが、逃げてばかりではダメ。

From this SO question [dame written as
katakana](https://japanese.stackexchange.com/questions/1930/why-dame-is-
written-as-katakana-%E3%83%80%E3%83%A1-in-manga) I think that ダメ is simply
adding emphasis. Otherwise, it makes no sense to me:

> It is not necessary to beat all enemies, escape is no good (?)

How do you all translate the sentence?




Think of it as being in the same boat as ～ては（いけない・ならない） which I'm sure you've
probably come across as the default phrases for prohibiting an action. It's
the same thing with ダメ. Using ダメ instead of いけない or ならない makes it sound a
little harsher or colloquial, I think.

"You don't have to beat every enemy, but you can't run away all the time."

