Idea For Dungeons

I think a nice idea for dungeons could be having a healer before the dungeon boss.

I have 3 variations on this:

1. Outside the door of the boss, there is an NPC who says something like "Oh! You can't possibly face (Boss name) in that state! Here, let me heal you up.

2. As the first point may be seen as making it too easy, I thought that perhaps there could be a cost for the first idea, so it's similar to buying potions, except that the NPC heals you fully and would cost more, like 50 emeralds in Decrepit Sewers, 75 in Infested Pit, 100 in Lost Sactuary and so on.

3. Maybe just have a potion merchant outisde the boss room (I realise that there's one outside the dungeon anyway, but I thought it might be a nice idea).

 

This seems sort of anti-dungeon. The whole point of dungeons in most MMORPGs is that they're challenges that you stock up on items for, then travel to and raid, not ones you can heal outside of and not need any prep.