This build is heal first, tank second, but it still does both very well.

Bulk Ring and Healthy Snacks give you a massive HP boost, which is perfect for going to the front with medicine ball. You're obviously not going to do much damage, but you'll be healing a wide range of people frequently. Healing charm, restoration ring, and vitality ring are great for increasing the heal you do.

Vitamin Water is great for self heal and giving a little boost to your damage output, but it also triggers the splash heal from every third attack of the medicine ball, which is why this is a really good choice. Revitalizing mist and splash heal are great for healing others (or yourself) when you see them on low health and don't think your medicine ball can heal quickly enough.

This build is AMAZING for the projects where you have to protect the shrine dancers or escort the hefty spirits or merchants. You won't kill any monsters while guarding them, but you can tank so much and provide so much healing to both yourself and the NPC that it's not an issue. I've used this build for these projects to go through around 10-20 monsters and maybe a boss or 2 while completing these projects several times on even corrupted shrine with 0 help from other bots/players.