Hallowed Ground. The ground around the mighty tree is infused with celestial power, warding from danger. The area within 120 ft of the tree is subject to the following effects:

• Elementals, fiends, and undead can't enter the area, nor can such creatures charm, frighten, or possess creatures within it. Any creature charmed, frightened, or possessed by such a creature is no longer charmed, frightened, or possessed upon entering the area.
• Dead bodies interred in the area can't be turned into undead.
• Creatures other than fiends and undead have resistance to [damage]poison[/damage] damage. Additionally, if a creature that is poisoned completes a long rest in the area, they are rid of the poison.

Blessings of the Feathered Flowers. The ever-present flowers swirl down around the tree, pulling free of the branches on petal wings. They flutter around a creature that has been granted the blessing, glowing in golden light. This can be determined by the DM, or be one of the following:

• The creature has advantage against charmed and frightened effects.
• The creature gains a knowledge of celestial and sylvan. 
• The creature can cast guardian of faith (DC 24) once, spending the blessing.
• The creature can cast the commune 3 times requiring no components and without expending a spell slot. 

This blessing could also form the basis of a celestial warlock pact or similar narrative source of magical power. 

Innate Spellcasting. Yul'magnolidon's spellcasting ability is Wisdom (spell save DC 24). It can innately cast the following spells:

At will: druidcraft, sacred flame, detect evil and good, detect thoughts, cure wounds, lesser restoration

1/day each: call lightning, greater restoration, death ward, wrath of nature, control weather

Multiattack. Yul'magnolidon can make three attacks.

Root Slam. Melee Weapon Attack: +14 to hit, reach 20 ft., 1 target. Hit: 33 (4d12 + 7) bludgeoning damage and the target is knocked prone. 

Woe of the Feathered Flowers (Recharge 5-6). The petal-winged birds that reside in the massive tree, swirl into a maelstrom that channels around the battlefield. Yul'magnolidon can choose an area of either a 120 by 10 ft line, or a 60 ft radius sphere, in a space within 300 ft of itself. Within this area creatures must make a DC 22 Constitution saving throw or take 56 (16d6) poison damage and be blinded until the end of their next turn. If a creature succeeds the saving throw, they take half the damage and are not blinded. Yul'magnolidon can protect up to 9 creatures within this area to be immune to the effects of the attack.

Bloom (Recharge 6). The flowers that coat the tree's branches burst in golden and rainbow-like dust creating a stunning display in the air around it. Creatures within 120 ft must make a DC 24 Charisma saving throw or be incapacitated for 1 minute as they stare transfixed by the display. This effect ends if the creature suffers damage. Yug'magnolidon can exempt up to 9 creatures within the area from the effect. 

Guidance. As a bonus action Yul'magnolidon can cast the guidance spell on a creature within 60 ft. 

Hungry Earth. When a creature is knocked unconscious within 120 ft of Yul'magnolidon, it can use its reaction to wind roots around its body, dragging it underground, out of reach and sight. When this happens, the creature is instantly killed, and Yul'magnolidon regains a number of hit points equal to half the maximum hit points of that creature. 

Yul'magnolidon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. They regains spent legendary actions at the start of its turn.

Wooden Lash. Yul'magnolidon makes a Root Slam attack. 

Grappling Roots. Roots burst from the ground toward a creature within 120 ft. The target must make a DC 22 Strength saving throw or become [condition]grappled[/grappled].

Cast a spell (Costs 2 Actions). Yul'magnolidon casts a spell.