Living underground gives you a unique view on crafting improvised weapons, below are some examples of what you can create. You must have the resources listed in the descriptions below to craft one of these. Or use your imagination!
Any crafting is done with Thieves tools plus Dex or Int Modifier.
Acid. The kobold hurls a flask of acid. Ranged Weapon Attack: +4 to hit, range 5/20 ft., one target. Hit: 7 (2d6) acid damage.
Alchemist's Fire. The kobold throws a flask of alchemist's fire. Ranged Weapon Attack: +4 to hit, range 5/20 ft., one target. Hit: 2 (1d4) fire damage at the start of each of the target's turns. A creature can end this damage by using its action to make a DC 10 Dexterity check to extinguish the flames.
Basket of Centipedes. The kobold throws a small basket into a 5-foot-square space within 20 feet of it. A swarm of insects (centipedes) with 11 hit points emerges from the basket and rolls initiative. At the end of each of the swarm's turns, there's a 50 percent chance that the swarm disperses.
Green Slime Pot. The kobold throws a clay pot full of green slime at the target, and it breaks open on impact. Ranged Weapon Attack: +4 to hit, range 5/20 ft., one target. Hit: The target is covered in a patch of green slime (see chapter 5 of the Dungeon Master's Guide). Miss: A patch of green slime covers a randomly determined 5-foot-square section of wall or floor within 5 feet of the target.
Rot Grub Pot. The kobold throws a clay pot into a 5-foot-square space within 20 feet of it, and it breaks open on impact. A swarm of rot grubs (see appendix A) emerges from the shattered pot and remains a hazard in that square.
Scorpion on a Stick. The kobold makes a melee attack with a scorpion tied to the end of a 5-foot-long pole. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 1 piercing damage, and the target must make a DC 9 Constitution saving throw, taking 4 (1d8) poison damage on a failed save, or half as much damage on a successful one.
Skunk in a Cage. The kobold releases a skunk into an unoccupied space within 5 feet of it. The skunk has a walking speed of 20 feet, AC 10, 1 hit point, and no effective attacks. It rolls initiative and, on its turn, uses its action to spray musk at a random creature within 5 feet of it. The target must make a DC 9 Constitution saving throw. On a failed save, the target retches and can't take actions for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. A creature that doesn't need to breathe or is immune to poison automatically succeeds on the saving throw. Once the skunk has sprayed its musk, it can't do so again until it finishes a short or long rest.
Wasp Nest in a Bag. The kobold throws a small bag into a 5-foot-square space within 20 feet of it. A swarm of insects (wasps) with 11 hit points emerges from the bag and rolls initiative. At the end of each of the swarm's turns, there's a 50 percent chance that the swarm disperses.
Choke Bomb. This small incendiary device burns rapidly and releases choking smoke in a 20-foot sphere. The area is heavily obscured. Any breathing creature that’s in the affected area when the cloud is created or that starts its turn in the cloud is poisoned. Once a poisoned creature leaves the cloud, it makes a DC 13 Constitution saving throw at the end of its turns, ending the poisoned condition on a success. The smoke dissipates after 10 minutes, or after 1 round in a strong wind.
Poisoned Sliver. A poisoned sliver or needle can be hidden almost anywhere: inside a lock or a box, in a carpeted floor, on the underside of a door handle, in a cup of liquid or a bowl of gems. When someone meets the conditions for being jabbed by the sliver, the trap makes a melee weapon attack with advantage: +5 to hit, reach 0 ft., one target; Hit: 2 (1d4) piercing damage plus 14 (4d6) poison damage, or one-half poison damage with a successful DC 13 Constitution saving throw.
Skullpopper. This trap consists of either a heavy weight, a spike, or a blade, set to fall or swing into a victim. When triggered, a skullpopper makes a melee weapon attack against the first target in its path: +5 to hit, reach 15 ft., one target; Hit: 11 (2d10) damage. The type of damage depends on how the skullpopper is built: a stone or heavy log does bludgeoning damage, a spiked log does piercing damage, a scything blade does slashing damage, etc.
Slingsnare. A concealed loop of rope or wire is affixed to a counterweight. When a creature steps into the snare, it must make a successful DC 13 Dexterity saving throw or be yanked into the air and suspended, upside down, 5 feet above the ground. The snared creature is restrained (escape DC 13). The cord is AC 10 and has 5 hit points.
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