The lair of a vyderac matron is usually a cliff side, massive tree, or other area with good vantage points on a high elevation. A vyderac matron is, in essence, her own lair, so she is always found within her lair and always has access to her lair action.

When fighting inside her lair, a vyderac matron can use lair actions. On initiative count 20 (losing initiative ties), a vyderac matron can take one lair action to cause one of the following effects; the vyderac matron can't use the same lair action two rounds in a row.

Vyderac Matron

Gargantuan monstrosity, unaligned

Armor Class 20 (natural armor)

20 (natural armor) Hit Points 277 (15d20 + 120)

277 (15d20 + 120) Speed 0 ft.

STR DEX CON INT WIS CHA 22 (+6) 5 (-3) 26 (+8) 8 (-1) 12 (+1) 7 (-2)

Saving Throws Con +13, Wis +6

Con +13, Wis +6 Damage Resistances bludgeoning, piercing, and slashing from nonmagical weapons

bludgeoning, piercing, and slashing from nonmagical weapons Damage Immunities acid, poison

acid, poison Condition Immunities charmed, exhaustion, poisoned, prone, restrained

charmed, exhaustion, poisoned, prone, restrained Senses passive Perception 11

passive Perception 11 Languages —

— Challenge 15 (13,000 XP)

Destructive Gestation. When the vyderac matron is reduced to 0 hit points (or when she chooses to activate this ability using her lair action), she immediately gestates a new matron larva and self-destructs, killing herself. The self-destruct causes a massive explosion of acid that affects all creatures within 100 feet. Each creature in that area must make a DC 19 Dexterity saving throw, taking 45 (10d8) acid damage on a failed save, and half as much on a successful one.

Area Control. Because of the vast swarms of vyderac in the 1 to 5 mile-radius area surrounding the matron, she is keenly aware of who and what is in her territory. A matron is aware, within 30 minutes, of any creature that enters her territory, how many creatures there are, and their general location.

Legendary Resistance (3/day). When the Vyderac Matron fails a save, it can choose to succeed instead.

Actions

Multiattack. The vyderac matron makes two attacks with her claws.

Claw. Melee Weapon Attack: +11 to hit, reach 15 ft., one target. Hit: 19 (3d8 + 6) bludgeoning damage. If the target is a Huge or smaller creature, it must succeed on a DC 19 Strength saving throw or be knocked backwards 20 feet and fall prone.

Acid Spit. Ranged Weapon Attack: +11 to hit, reach 40/80 ft., one target. Hit: 27 (5d10) acid damage and an additional 11 (2d10) acid damage at the start of the target's next turn. Additionally, vyderac within 50 feet will choose the target to attack if they are able to.

Legendary Actions

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

Claw. The vyderac matron makes a claw attack.

Acid Spit (2 actions). The vyderac matron makes an acid spit attack.

Consume Blood. If a vyderac feeder is within 20 feet of the matron, she can consume the blood stored within it to regain 13 (3d8) hit points.

Spawn Maggots (2 actions). The vyderac matron spawns 1d6 vyderac maggots in random spaces within 5 feet of the matron.