Ankheg experiment 130-L

 Corrosive Acids. When a creature hits the Ankheg, roll a d4. On a 1, the creature's weapon takes a -1 penalty to the weapons damage, to a max of -5, when the weapon is then destroyed. If it is hit with bare hands (or bare anything) the creature takes 2d4 acid damage. Any ranged weapon's ammunition is destroyed when it hits the Ankheg.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 4) slashing damage plus 6 (2d6) 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 10 (3d6) acid damage on a failed save, or half as much damage on a successful one.