Kassoon

This is homebrew, submitted by a member of the community.

Adult Blue Dracolich

Adult Blue Dracolich

Undead Dragon, Chaotic EvilUndead Dragon, Chaotic Evil
Armor Class 1919
[~<13]
+/-/*
Hit Points 225 (18d12+108)225 (18d12+108)
[~1-6]
Speed walking 40, burrowing 30, flying 80walking 40, burrowing 30, flying 80

STR
25 (+7)
DEX
10 (+0)
CON
23 (+6)
INT
16 (+3)
WIS
15 (+2)
CHA
19 (+4)

Token URL:
Saving Throws Dex +6, Con +12, Wis +8, Cha +10 Dex [+6], Con [+12], Wis [+8], Cha [+10]
Skills Perception +14, Stealth +6 Perception [+14], Stealth [+6]
Damage Vulnerabilities
Damage Resistances necrotic
Damage Immunities lightning, poison
Condition Immunities charmed, exhaustion, frightened, paralyzed, poisoned charmed, exhaustion, frightened, paralyzed, poisoned
Senses blindsight 60 ft., darkvision 120 ft., passive Perception 24blindsight 60 ft., darkvision 120 ft., passive Perception 24
Languages Common, DraconicCommon, Draconic
PB +6
Challenge 17 (18,000 XP)

[+instructions]

Legendary Resistance (3/Day). If the dracolich fails a saving throw, it can choose to succeed instead.
Magic Resistance. The dracolich has advantage on saving throws against spells and other magical effects.

Legendary Resistance (3/Day). If the dracolich fails a saving throw, it can choose to succeed instead.
Magic Resistance. The dracolich has advantage on saving throws against spells and other magical effects.

Actions

[~Hit +2, DC <13, DPR 0-1]

Multiattack. The dracolich can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 18 (2d10+7) piercing damage plus 5 (1d10) lightning damage.
Claw. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 14 (2d6+7) slashing damage.
Tail. Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 16 (2d8+7) bludgeoning damage.
Frightful Presence. Each creature of the dracolich's choice that is within 120 feet of the dracolich and aware of it must succeed on a DC 18 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dracolich's Frightful Presence for the next 24 hours.
Lightning Breath (Recharge 5–6). The dracolich exhales lightning in a 90-foot line that is 5 feet wide. Each creature in that line must make a DC 20 Dexterity saving throw, taking 66 (12d10) lightning damage on a failed save, or half as much damage on a successful one.

Multiattack. The dracolich can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: [+13] to hit, reach 10 ft., one target. Hit: 18 ([2d10+7]) piercing damage plus 5 ([1d10]) lightning damage.
Claw. Melee Weapon Attack: [+13] to hit, reach 5 ft., one target. Hit: 14 ([2d6+7]) slashing damage.
Tail. Melee Weapon Attack: [+13] to hit, reach 15 ft., one target. Hit: 16 ([2d8+7]) bludgeoning damage.
Frightful Presence. Each creature of the dracolich's choice that is within 120 feet of the dracolich and aware of it must succeed on a DC 18 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dracolich's Frightful Presence for the next 24 hours.
Lightning Breath (Recharge 5–6). The dracolich exhales lightning in a 90-foot line that is 5 feet wide. Each creature in that line must make a DC 20 Dexterity saving throw, taking 66 ([12d10]) lightning damage on a failed save, or half as much damage on a successful one.

Legendary Actions

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

Detect. The dracolich makes a Wisdom (Perception) check.

Tail Attack. The dracolich makes a tail attack.

Wing Attack (Costs 2 Actions). The dracolich beats its tattered wings. Each creature within 10 feet of the dracolich must succeed on a DC 21 Dexterity saving throw or take 14 (2d6+7) bludgeoning damage and be knocked prone. After beating its wings this way, the dracolich can fly up to half its flying speed.

The dracolich can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The dracolich regains spent legendary actions at the start of its turn.
Detect. The dracolich makes a Wisdom (Perception) check.

Tail Attack. The dracolich makes a tail attack.

Wing Attack (Costs 2 Actions). The dracolich beats its tattered wings. Each creature within 10 feet of the dracolich must succeed on a DC 21 Dexterity saving throw or take 14 ([2d6+7]) bludgeoning damage and be knocked prone. After beating its wings this way, the dracolich can fly up to half its flying speed.
 

Details

Lair Actions

On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects; the dragon can't use the same effect two rounds in a row:

Part of the ceiling collapses above one creature that the dragon can see within 120 feet of it. The creature must succeed on a DC 15 Dexterity saving throw or take 10 (3d6) bludgeoning damage and be knocked prone and buried. The buried target is restrained and unable to breathe or stand up. A creature can take an action to make a DC 10 Strength check, ending the buried state on a success.
A cloud of sand swirls about in a 20-foot-radius sphere centered on a point the dragon can see within 120 feet of it. The cloud spreads around corners. Each creature in the cloud must succeed on a DC 15 Constitution saving throw or be blinded for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Lightning arcs, forming a 5-foot-wide line between two of the lair's solid surfaces that the dragon can see. They must be within 120 feet of the dragon and 120 feet of each other. Each creature in that line must succeed on a DC 15 Dexterity saving throw or take 10 (3d6) lightning damage.
Lair Actions
On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects; the dragon can't use the same effect two rounds in a row:

Part of the ceiling collapses above one creature that the dragon can see within 120 feet of it. The creature must succeed on a DC 15 Dexterity saving throw or take 10 ([3d6]) bludgeoning damage and be knocked prone and buried. The buried target is restrained and unable to breathe or stand up. A creature can take an action to make a DC 10 Strength check, ending the buried state on a success.
A cloud of sand swirls about in a 20-foot-radius sphere centered on a point the dragon can see within 120 feet of it. The cloud spreads around corners. Each creature in the cloud must succeed on a DC 15 Constitution saving throw or be blinded for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Lightning arcs, forming a 5-foot-wide line between two of the lair's solid surfaces that the dragon can see. They must be within 120 feet of the dragon and 120 feet of each other. Each creature in that line must succeed on a DC 15 Dexterity saving throw or take 10 ([3d6]) lightning damage.
 
Source
 
Environments Regional Effects
The region containing a legendary blue dragon's lair is warped by the dragon's magic, which creates one or more of the following effects:

Thunderstorms rage within 6 miles of the lair.
Dust devils scour the land within 6 miles of the lair. A dust devil has the statistics of an air elemental, but it can't fly, has a speed of 50 feet, and has an Intelligence and Charisma of 1 (-5).
Hidden sinkholes form in and around the dragon's lair. A sinkhole can be spotted from a safe distance with a successful DC 20 Wisdom (Perception) check. Otherwise, the first creature to step on the thin crust covering the sinkhole must succeed on a DC 15 Dexterity saving throw or fall [1d6] × 10 feet into the sinkhole.
If the dragon dies, the dust devils disappear immediately, and the thunderstorms abate within [1d10] days. Any sinkholes remain where they are.

Environment: Desert

 
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Monster Statistics by Challenge Rating

CRProf. BonusACHPAttack BonusDamage / RoundSave DC
0+2<131-6<+30-1<13
1/8+2137-35+32-313
1/4+21336-49+34-513
1/2+21350-70+36-813
1+21371-85+39-1413
2+21386-100+315-2013
3+213101-115+421-2613
4+214116-130+527-3214
5+315131-145+633-3815
6+315146-160+639-4415
7+315161-175+645-5015
8+316176-190+751-5616
9+416191-205+757-6216
10+417206-220+763-6816
11+417221-235+869-7417
12+417236-250+875-8017
13+518251-265+881-8618
14+518266-280+887-9218
15+518281-295+893-9818
16+518296-310+999-10418
17+619311-325+10105-11019
18+619326-340+10111-11619
19+619341-355+10117-12219
20+619356-400+10123-14019
21+719401-445+11141-15820
22+719446-490+11159-17620
23+719491-535+11177-19420
24+719536-580+12195-21221
25+819581-625+12213-23021
26+819626-670+12231-24821
27+819671-715+13249-26622
28+819716-760+13267-28422
29+919761-805+13285-30222
30+919806-850+14303-32023

Damage Severity by Level

LevelSetbackDangerousDeadly
1-41d102d104d10
5-102d104d1010d10
11-164d1010d1018d10
17-2010d1018d1024d10

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