False Appearance. While the corrupted treant remains motionless, it is indistinguishable from a normal tree.
Legendary Resistance (3/Day). If the corrupted treant fails a saving throw, it can choose to succeed instead.
Siege Monster. The corrupted treant deals double damage to objects and structures.
Thorn Spike Regrowth. The corrupted treant has fifty thorn spikes adorning its arms. Used spikes regrow when the corrupted treant finishes a long rest.
Spellcasting. The corrupted treant is an 12th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 17, +9 to hit with spell attacks). It has the following druid spells prepared:
Cantrips (at will): [spell/druidcraft [/spell], [spell/frostbite [/spell], [spell/infestation [/spell], [spell/thorn whip [/spell]
1st level (4 slots): [spell/absorb elements [/spell], [spell/earth tremor [/spell], [spell/entangle [/spell], [spell/thunderwave[/spell]
2nd level (3 slots): [spell/heat metal [/spell], [spell/hold person [/spell], [spell/spike growth [/spell], [spell/wither and bloom[/spell]
3rd level (3 slots): [spell/call lightning [/spell], [spell/dispel magic [/spell], [spell/sleet storm [/spell]
4th level (3 slots): [spell/blight [/spell], [spell/giant insect [/spell], [spell/grasping vine [/spell]
5th level (2 slots): [spell/maelstrom [/spell], [spell/wrath of nature [/spell]
6th level (1 slot): [spell/ wall of thorns [/spell]
Multiattack. The corrupted treant makes two slam attacks.
Slam. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 22 (3d6 + 6) bludgeoning damage. If the creature is large of smaller, it must succeed on a DC 21 Strength saving throw or be knocked prone.
Thorn Spike. Ranged Weapon Attack: +10 to hit, range 150/300 ft., one target. Hit: 26 (2d8 + 6) piercing damage.
Animate Treants (3/Day). The corrupted treant magically animates one or two trees it can see within 60 feet of it. These trees have the same statistics as a treant. A treant acts as an ally of the corrupted treant. The treant remains animated for one year or until it dies; until the corrupted treant dies or is on a different plane of existence than the treant; or until the corrupted treant uses a bonus action to turn it back to an inanimate tree. The tree then takes root if possible.
The corrupted treant can take 3 legendary actions, choosing from the options below. It can take only one legendary action at a time and only at the end of another creature’s turn. The corrupted treant regains spent legendary actions at the start of its turn.
Attack. The corrupted treant makes one slam attack.
Cantrip. The corrupted treant casts one of its cantrips.
Command Treants (Costs 2 Actions). The corrupted treant commands any two treants, animated trees, or awakened trees within 60 feet of it to immediately make a slam attack as a reaction.
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