Protection of the Erdtree grants a Body Buff that decreases Fire, Holy, Lightning, and Magic damage taken by 30% (10% in PvP) for 70 seconds for the caster and allies within a 6-meter radius.
This spell reduces damage taken rather than directly increasing damage negation. The total damage reduction can be expressed by the following formula, where ProtectionOfTheErdtree represents the effect magnitude:
For example, if affinity damage negation is 25 at the time of casting, the total reduction against PvE enemies would be 51.25%:
Against other players, the total reduction would be 32.5%:
Strategies
Protection of the Erdtree is a versatile defensive incantation that protects both the caster and allies from multiple damage types, making it invaluable in more varied combat scenarios.
Available earlier than other defensive incantations that also affect nearby allies, as it can be accessed from the beginning of the game if players brave the path toward Altus Plateau. In contrast, other shareable defensive buffs are found later in the game, either at the end of Leyndell, Royal Capital or after it.
Unlike other advanced defensive incantations, Flame, Protect Me only affects the caster. Therefore, Protection of the Erdtree is the only way to grant nearby allies protection specifically against Fire damage.
While it is the weakest defensive Body Buff incantation, it strengthens all non-Physical damage negations, making it useful as a Furled Finger for not having to carry multiple defensive incantations when summoned via Summoning Pools.