Sirena can use a bonus action to take the Hide action on her turn.

When a creature attacks Sirena, she can use a reaction to impose disadvantage on all attack rolls against her by that creature for the rest of the turn. She must see the attacker and cannot use this feature against a creature she cannot see.

Sirena draws and fires a longbow with practiced precision. With Archery and Extra Attack, she can make two ranged attacks, each benefiting from her +2 Archery bonus.

When Sirena hits a creature that is below its hit point maximum, she adds 1d8 damage once per turn.

Sirena uses the terrain to avoid pursuit and reposition without exposing her allies.

Sirena has chosen beasts and humanoids as favored enemies. She has advantage on Wisdom (Survival) checks to track them and Intelligence checks to recall information about them. She also knows one language of her choice associated with a favored enemy, Goblin.

Sirena is especially familiar with forests and grasslands. While traveling for an hour or more in her favored terrain, she gains the normal benefits of traveling at a fast pace, can forage twice as much food, remains alert to danger even while engaged in another activity, and can move stealthily at a normal pace when traveling alone. When traveling with others, she can guide them without slowing their pace, and she cannot become lost except by magical means.

Sirena adopts Archery as her fighting style, gaining a +2 bonus to attack rolls made with ranged weapons.

Sirena is a 3rd-level ranger spellcaster. Wisdom is her spellcasting ability. She knows seven ranger spells and uses a druidic focus or component pouch when required.

Sirena chooses the Hunter archetype, specializing in precise attacks and battlefield endurance.

Once per turn, when Sirena hits a creature with a weapon attack, she can deal an extra 1d8 damage if the target is below its hit point maximum.

Sirena can spend one minute in communion with nature to sense whether aberrations, celestials, dragons, elementals, fey, fiends, or undead are present within 1 mile, or within 6 miles in her favored terrain. This feature does not reveal their exact location or number.

At 4th level, Sirena increases one ability score by 2 or two ability scores by 1. This character's provided ability scores are recorded before applying optional ability score improvements.

Sirena gains an additional favored enemy, undead, along with the associated tracking and recall benefits. She also learns one additional language, Infernal.

Sirena gains an additional favored terrain, mountains. Her Natural Explorer benefits apply there as well.

Sirena can make two attacks instead of one whenever she takes the Attack action on her turn.

At 8th level, Sirena increases one ability score by 2 or two ability scores by 1. This character's provided ability scores are recorded before applying optional ability score improvements.

Moving through nonmagical difficult terrain costs Sirena no extra movement. She can pass through nonmagical plants without being slowed or taking damage from them, and she has advantage on saving throws against magically created or manipulated plants.

At 10th level, Sirena increases one ability score by 2 or two ability scores by 1. This character's provided ability scores are recorded before applying optional ability score improvements.

Sirena can spend 1 minute creating camouflage for herself. While camouflaged against a solid surface with access to mud, dirt, plants, soot, or other naturally occurring materials, she gains a +10 bonus to Dexterity (Stealth) checks while remaining still.

When Sirena is hit by an attack, she can use her reaction to gain a +4 bonus to AC against that attack, potentially causing it to miss. She can use this feature after knowing the attack hits but before damage is rolled.

Sirena has an excellent memory for maps and geography. She can always recall the general layout of terrain, settlements, and natural features she has seen, and she can find food and fresh water for herself and up to five other people each day, provided the land offers such resources.