I thought each bone shard you burned was supposed to increase your Estus flask level by one, and therefore your bonfire level would equal your Estus Flask level. So I'm not sure if I'm missing something, but in my playthrough I burned *five* undead bone shards. Cast it into the shrine bonfire to boost the recovery provided by the Estus Flask. I'm fairly decent at the game, so I guess I could do fine without one of the estus upgrades (especially since I tend to use the "better estus" ring). FireLink Shrine. Found in the basement down the … Undead Bone Shard is a Consumable in Dark Souls 3 which you must collect to not only raise the Bonfire Level but also for an effective Estus Flask. Undead bones that yet burn. This will be much easier if you visit the Giant atop the tower and make peace with him first! An Undead Bone Shard is a tool that can be burned in the Firelink Shrine bonfire to increase the level of all Estus Flasks.. In-game description. However, my Estus Flask is still +4. Unfortunately the only way to get it seems to be to trade away an undead bone shard. you can only use them to upgrade the strength of your estus flask up to +10, and can only use them at the firelink shrine bonfire, so youre best off just using them when you get them User Info: SoundNetwork The bonfire's cinders are bones of Undead, and a bone that still burns is a fresh cinder indeed. Undead Bone Shard – increases how much health is gained from Estus healing. Either get the tower key or do the tree skip. Give the shards to Andre the blacksmith, choose upgrade estus from his screen, this will give you another swig of the estus. The Undead Bone Shard is located on a small section of ground to the right of the main path. Estus Shard #1. Wall of Lothric. The shard is on one of the bars near the bird. My last burning didn't upgrade the Flask. My bonfire level is five. When you get undead bone shards, burn them in at the bonfire at firelink shrine to get a +1 to your estus, upgrading how much it heals. Estus shard #2. Undead Bone Shards are an interesting and unique item that function similar to the way that Humanity worked in the original Dark Souls game.