5e Monsters - Rune Giant

This giant’s skin is black and pitted, like roughly cast iron, and etched with glowing red runes.
Rune Giant CR 20+
LE Gargantuan humanoid (giant) - 40' tall
Init +0; Senses low-light vision; Passive Perception 21
Proficiency +6
Str 30 (+10), Dex 11 (+0), Con 24 (+7), Int 14 (+2), Wis 21 (+5), Cha 18 (+4)
AC 23 (Rune Plate)
hp 345
Good Saves STR +16 CON +13 INT +8 WIS +11 CHA +10
Resistance: cold, lightning, fire
Immune: Charm as long as their controlling Runelord is alive.
Advantage on saves against Banishment and other involuntary transportation (Plane Shift etc).
Speed 60 ft.

COMBAT
A Rune Giant may make 3 attacks using Greatsword & Javelin (2 only) in any combination, as well as a bonus action Spark Shower (if available). They typically open combat with 2 javelins of lightning, close in & use Spark Shower, then finish with one Greatsword strike.

Melee Greatsword  ATT +16 dam 45 slashing (crit 67 slasing on 19–20)

Ranged Javelin of Lightning ATT +16 dam 31 piercing (crit 46 piercing on 19-20) plus a 10'x60' lightning bolt extends 60' from the impact point doing 28 lightning (crit 56) damage to target, those behind target take 28 lightning and may make a DC 18 DEX save for half damage; javelin range 120'/360'; a SML target hit by the javelin is Pushed back 10' and must make a DC 25 STR save or be knocked Prone.

Space 20 ft.; Reach 20 ft.
Equipment: Greatsword, 2 javelins.
Special Attacks command giants, runes, spark inferno 3/SR

Spell-Like Abilities (Spell Save DC 18; Spell Attack +10)
At will—charm person; suggestion
3/SR—mass charm monster; dominate person
3/LR— true seeing; air walk

Skills Athletics +16; Craft +8;  Knowledge (history) +8, Knowledge (nobility) +8, Perception +11
Languages Common, Giant, Terran

SPECIAL ABILITIES
Command Giant
Giants (including Goliath) have disadvantage on saves vs  charm or compulsion effects used by rune giants.

Runes
Whenever a rune giant uses its spark inferno or spell-like abilities, it can cause the runes on its body to flash with light. All creatures within 10 feet of the giant must make a DC 18 CON save or be Blinded until the end of their next turn.

Spark Inferno (Recharge 5-6)
As a bonus action, a rune giant can cause a storm of sparks to erupt out of one of the runes on its body. These sparks function as a 30-ft. cone; 45 fire and 45 lightning damage; DC 18 DEX save for half (22-22)

Shattered Star: The Asylum Stone 5e D&D monsters - Boggard & Giant Dragonfly

Boggard

CR 2

CE Medium humanoid (boggard)

PB+2   Init -1; Senses darkvision 60 ft., low-light vision; Perception +4

 DEFENSE

AC 11   hp 33 

OFFENSE

Speed 20 ft., swim 30 ft. Long jump 20' high jump 10', no opportunity attacks.

Attack action: The boggard uses sticky tongue & makes two 2-handed spear attacks.
Melee 
2-handed spear (2 attacks) +4 (1d10+2) reach 10',
tongue +4 (sticky tongue) reach 10'

Str 15, Dex 9, Con 14, Int 8, Wis 11, Cha 10

Save DEX +1
Skills Athletics +6, Stealth +1 with advantage in swamps
Languages Boggard
SQ amphibious, swamp stride

 SPECIAL ABILITIES

A creature hit by a boggard’s tongue attack is grappled as long as the tongue is attached (this penalty does not stack if multiple tongues are attached). The tongue can be removed by making an opposed Strength (athletics) check as an action or by dealing 2 points of slashing damage to the tongue (AC 11, max 2 dmg to boggard). The boggard cannot move more than 10 feet away from the target, but the boggard can release its tongue at will. A boggard cannot pull medium or larger targets toward it with its tongue.

Swamp Stride (Ex)

A boggard can move through any sort of natural difficult terrain at its normal speed while within a swamp. Magically altered terrain affects a boggard normally.

Terrifying Croak (Su)

Once per hour, a group of three or more boggards can emit a loud and horrifying croak at the start of their turn. Any non-boggard creature within 30 feet of the boggards must make a DC 12 WIS save or become frightened (save at end of turn). Creatures that succeed at this save cannot be affected again by boggards' croak for 24 hours. 

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Dragonfly, Giant

CR 4

N Medium vermin
PB +2 Init +2; Senses darkvision 60 ft.; Perception +3
AC 15  hp 67

Immune mind-affecting effects

Speed 20 ft., fly 80 ft. (perfect)

Melee bite +6  Hit: 19/33 (3d8+6) damage plus grapples target. It has advantage vs its grappled target and can make a second attack vs the target in the same turn. Other adjacent attackers have advantage vs the grappling dragonfly.

Str 19, Dex 15, Con 14, Int 1, Wis 12, Cha 9

SA: A giant dragonfly that does not grapple after attacking can Disengage as a bonus action.