Encounter 18 - lvl 5 to 10

4x Ankheg Large monstrosity , unaligned
Armor Class 14 (Natural Armor), 11 While Prone Hit Points (6d10 + 6) Speed 30 ft., burrow 10 ft.
STR 17 (+3) DEX 11 (+0) CON 13 (+1) INT 1 (-5) WIS 13 (+1) CHA 6 (-2)
Senses Darkvision 60 ft., Tremorsense 60 ft., Passive Perception 11 Languages -- Challenge 2 (450 XP) Proficiency Bonus +2
Actions Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: (2d6 + 3) slashing damage plus (1d6) acid damage. If the target is a Large or smaller creature, it is grappled (escape DC 13). Until this grapple ends, the ankheg can bite only the grappled creature and has advantage on attack rolls to do so.
Acid Spray (Recharge 6). The ankheg spits acid in a line that is 30 feet long and 5 feet wide, provided that it has no creature grappled. Each creature in that line must make a DC 13 Dexterity saving throw, taking (3d6) acid damage on a failed save, or half as much damage on a successful one.
2x Dragonflesh Grafter Large monstrosity , typically neutral evil
Armor Class 14 (Natural Armor) Hit Points (7d10 + 14) Speed 30 ft.
STR 16 (+3) DEX 11 (+0) CON 14 (+2) INT 10 (+0) WIS 10 (+0) CHA 6 (-2)
Saving Throws STR +5, CON +4 Senses Passive Perception 10 Languages Common, Draconic Challenge 3 (700 XP) Proficiency Bonus +2
Actions Multiattack. The grafter makes one Claw attack and one Greatclub attack.
Claw. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: (1d8 + 3) slashing damage plus (1d10) poison damage.
Greatclub. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: (2d8 + 3) bludgeoning damage.
Acid Retch (Recharge 5–6). The grafter retches forth a spray of acidic bile in a 30-foot cone. Each creature in that area must make a DC 12 Dexterity saving throw, taking (4d6) acid damage on a failed save, or half as much damage on a successful one.