Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit:10 (2d6 + 3) slashing damage plus 3 (1d6) acid damage. If the target is a Large or smaller creature, it is grappled (escape DC 13). Until this grapple ends, the crawler can bite only the grappled creature and has advantage on attack rolls to do so.
Acid Spray (Recharge). The crawler 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.
The black mana that brews and festers in Zendikar's swamps infuses a wide variety of natural animals, creating large, deadly vermin—rats, bats, insects, scorpions, and spiders that spread death and decay with their bites, stings, or caustic saliva. The swamps of Guul Draz are home to many such creatures, from the enormous heartstabber mosquitoes (best represented with stirge statistics) to giant scorpions large enough to hold a struggling vampire in one claw. The gigantic, ant-like…