Having a villager that is a healer is important as it enables you to do the following during the game:
• Support the sick villagers.
• Prolong the general lifespan of your villagers.
• Get a master villager to complete puzzles (build the green statue in puzzle 11).
• Get the master villager to wear the fancy yellow cloak.
When you assign a villager to be the healer you lose their use as a worker as the healer will do nothing but laze around until someone is sick. It is therefore advised that you choose a villager that does not like working to be a healer unless you want a master villager in which case you will need to use a villager who likes running so they are able to max other skills at double the speed or someone who likes working so they can also do things like laundry.
Below is list of things you can do to enhance the healing skills of your designated healer when your villagers are sick.
1. Same Healer
Use the same villager to heal all sick villagers
2. Poisonous Frogs
If your medicine is not at level 3 use your healer to remove poisonous frogs from sick villagers.
3. Get Poison
Use adult villagers to get poison (before completing puzzle 9). Doing this will make the villager sick and the healer can then cure them.
4. Limit the Village Food
This can easily be achieved by not assigning any villagers to be farmers. When the village does not have enough food the inhabitants become weak and sick. Let the healer heal them and once you reach your goal reassign farmers (or watch advertisement videos) to restore health and safety in the village again.
Use your lavastones. If you feel lucky you can always click on any villager and spin the lavastone wheel and hope you get the master villager. The master villager option only comes out once, so you need to reincarnate your master villager at 20 lavastones should you need a master villager again.