Blood-linked Familiars can be purchased in the Blood Crypt by spending Blood Relics. You may only purchase each Blood-Linked Familiar once. Blood-Linked Familiars cannot be evolved, empowered, released, traded or sacrificed for its skills. The skill of a Blood-Linked Familiar cannot be raised by forming a Blood Brothers bond. Blood-Linked Familiars obtained in the Blood Crypt will be placed in your Wagon.
- Main article: Blood Crypt
The Blood Crypt resurrection is where Blood Relics are exchanged for Blood-linked Familiars and Soul Fragments. The Blood Crypt resurrection can be accessed at “Home > Info > Others > Blood Crypt resurrection”.
The Blood-Linked Familiar page consists of two sub-pages: one containing the stats boost tree, and one containing the skills boost tree. You can change sub-pages using the red arrows at the side of the sub-page.
The stats sub-page shows the stats upgrade tree, made up of upgrades. Within the tree, you may upgrade your stats, skill level and rarity of your Blood-linked Familiar. Aside from the first tier of the stat upgrade tree, you can only choose an upgrade if it is connected to a previous tier. Boosting a stat requires both gold and Soul Fragments. The cost of the upgrade is shown on the top of the page. Once you have boosted a stat, upgrades in the next tier below the upgraded stat are unlocked. Certain upgrades provide a larger stat increase than others, depending on the level of blood shown on the upgrade image. You may unboost a boosted stat for a smaller refund by selecting the upgrade, and then pressing Unboost. You cannot unboost a stat if it is linked to a higher tier of upgrades. The only upgrade that is not able to be unboosted is the Double Skill upgrade.
This page shows the skills that the Blood-linked Familiar is able to learn. Skills are boosted in the same way as stats, and require both gold and Soul Fragments to be boosted. Once boosted, skills can be unboosted for a smaller refund. You may learn multiple skills without fully upgrading your first skill (if the familiar has more than 1 skill slot). Boosting and unboosting a skill does not change your current skill level.