Magic Weapons Abnoba's attacks are magical 

Legendary Resisistance(3/day) If Abnoba fails a saving throw she can choose to succeed instead

Regeneration At the end of the round Abnoba heals 30 HP

Spellcasting. Abnoba is a 20th-level spellcaster. Its spellcasting ability is wisdom Spellsave DC 23, +15 to hit with spell attacks. Abnoba has following Druid spells prepared: 
Cantrips (at will): Thorn Whip(17th level), Poison Spray(17th level), Shape Water
1st level (4 slots): Ice Knife, Thunderwave, Absorb Elements, Entangle
2nd level(3 slots): Barkskin, Gust Of Wind, Lesser Restoration, Spike Growth
3rd level(3 slots): Sleet Storm, Wall Of Water, Water Walk, Meld Into Stone
4th level(3 slots): Wall Of Fire, Blight
5th level(3 slots): Wall Of Stone, Maelstrom
6th level(2 slots): Wind Walk, Sunbeam
7th level(2 slots): Whirlwind, Reverse Gravity
8th level(1 slot): Tsunami, Feeblemind
9th level(1slot):Storm Of Vengeance

Multiattack Abnoba does 2 vine whip attacks

Vine Whip +14 to hit, reach 15 ft., one target. Hit: 30 (4d10 + 6) slsh damage plus (4d8) acid damage

Seed Bomb  +14 to hit, range 100/400 ft., three targets. Hit: 38(4d12 + 12) acid damage.

Tree Growth Abnoba can take her reaction to grow a tree in front of her making the attacker attack the tree instead

Abnoba 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. Abnoba regains spent legendary actions at the start of his turn.

Cantrip (Costs 1 Actions). Abnoba casts a cantrip

Undying Touch (Costs 3 Actions) Abnoba heals herself 30 HP and can't take damage for the next turn