en_tn_lite_do_not_use/isa/03/06.md

let this ruin be under your charge

"Take charge of this ruin" or "Rule over this ruin."

this ruin

This can be translated as "this city, which is now a pile of ruins" (UDB) or "this place that has been destroyed."

I will not be a healer

This can be translated as "No, I cannot fix this problem," or "No, I cannot help you" (UDB).