At 14th level, you no longer age, and cannot be magically aged. You also no longer require food.

Additionally, when you use Spirit of the ForestSylvan Retreat you can now choose an ally instead of a tree or other foliage to be the object to which you teleport.

Beginning at 10th level, your connection with the forest deepens, enabling you to call upon it for vitality. You gain proficiency in Constitution saving throws and resistance to poison damage.

Beginning at 6th level, you can use your connection with nature to escape from harm. Whenever you are within 30 feet of a tree or other foliage of Medium size, you can use your reaction to instantly teleport to a location within 10 feet of the foliage. If it is your turn, you can take the Hide action as a bonus action. You can use this ability once per long rest.

Additionally, you have the ability to meld into nature. While in contact with a tree or foliage of at least Medium size you can take the Hide action to become invisible. You remain invisible until you are farther than 5 feet from the foliage, cast a spell, or perform a hostile action.

At 1st level, your spirit is infused with the tranquility of nature. Your features take on the appearance of soft wood and your hair now appears to be made of leaves and foliage that change color with the seasons.

The Forest Ancient lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

You have made a pact with a guardian of the forest, an ancient manifestation of the primal forces of nature. Forest ancients can be counted amongst the wisest and mightiest of the world's denizens. Ancients are revered by all forest-creatures and are often infested with lesser spirits amongst their branches, roots, and hollows. For their part, the ancients cherish all lesser creatures, which grants them a great many allies. These incredibly old beings have seen entire races rise and fall like the passing of the sun, and understand the passage of time in a completely different way to mortal creatures. Forest ancients pursue the growth and nourishment of nature and are inherently at odds with the expansion of civilization.

As an action, you can transform into a Large animate tree. Hostile creatures within 30 feet must make a Dexterity saving throw as vines sprout from the ground attempting to drag them towards your location. Those that fail are pulled to your location and restrained against the tree. At the start of each of their following turns, they must make a Wisdom saving throw or be incapacitated until the start of their next turn. They can use their action to make a Strength (Athletics) check against your warlock spell save DC to free themselves. This effect persists up to one minute as long as you maintain concentration on it as though it were a spell. You can use your action on each of the following turns to cause the vines to attempt to grab another creature within 30 feet of the you.

You can use this ability once per long rest.

Eldritch Invocations

Whenever you would learn an eldritch Invocation, you may select one of the following as long as you meet the prerequisite.

Book of the Wilds

Prerequisite: Forest Ancient patron, Pact of the Tome feature

Whenever you heal a creature, you can use a bonus action to cast a cantrip targeting a hostile creature within 10 feet of the healed creature. You can do this ability once per short or long rest.

Dreamwalk

Prerequisite: Forest Ancient patron, 14th level

You can cast transport via plants once per long rest without expending a spell slot.

Eyes of the Forest

Prerequisite: Forest Ancient patron

As an action, you can choose to perceive from the location of a tree within 120 feet. While you do so, you are considered deaf and blind to your own senses.

Kindred Spirit

Prerequisite: Forest Ancient patron, Pact of the Chain feature

You can select a bonded magpie as your familiar.

If you have a bonded magpie as your familiar, it gains additional maximum hit points equal to your warlock level. Whenever you or it reduce a creature to 0 hit points, it can use a reaction to recover a single use of its dissonant whispers spell.

Nature's Ally

Prerequisite: Forest Ancient patron, 7th level

You can cast conjure woodland beings using a Warlock spell slot once per long rest.

Nature's Wrath

Prerequisite: Forest Ancient patron, eldritch blast cantrip

Whenever you cast eldritch blast, you can use your bonus action to empower it with nature's wrath. The damage dice per blast changes to 3d4. Each target must make a Constitution saving through, on a fail the target is inflicted with the poisoned condition.

The Oaken Hammer

Prerequisite: Forest Ancient patron, Pact of the Blade feature

You can create a maul of ironwood and polished marble using your Pact of the Blade feature. This weapon deals radiant damage. Whenever you hit a creature with this weapon, you can expend a warlock spell slot to heal a target of your choosing within 30 ft. of you for 1d6 hit points per spell level expended as a bonus action.