Talk:Estus Flask (Dark Souls)/@comment-50.13.54.230-20140705182037/@comment-25561331-20141101152419

The Bonfires heal you. When you sit next to one, you are restored. With the Estus, you may just be bottling up some of the essence of the fire. Kindling the fire more intense, and makes the Estus more intense. You simply need less to drink to heal more. As a regular Estus flask, you need only a few drinks to heal fully. Reinforcing the flasks may make the flame more pure when it is stored inside the flask.

TL;DR: Reinforcing the flask itself will increase the potency by means of a cleaner container. Kindling the fire makes the source of the healing more intense.