Scrappy Sapper

Kobolds are really talented at two things: cowering and ambushing.  You specialize in the latter.  You gain the following benefits:

• You gain proficiency with thieves' tools, tinker's tools, carpenter's tools, or mason's tools.
• You gain proficiency with improvised weapons, and can use Dexterity for your attack and damage rolls with improvised weapons.
• You have a knack for setting up- and taking apart- traps.  You have advantage on any ability check relating to setting up or disabling a trap that has not been triggered, and you have advantage on Wisdom (Perception) and Intelligence (Investigation) checks to notice traps.
• As long as you remain still while hiding, you have advantage on any Dexterity (Stealth) checks you make to remain hidden.