Poison Injector Blade (3.5e Equipment)
From D&D Wiki
The Poison Injector Blade is a dagger with a hallow handle and a small 7 small holes along the blade (3 on each side and 1 at the tip) that are connected to the handle space. In the hollow space, a vial of poison can be placed. When the dagger hits on a successful attack, the poison is injected into the target. The advantages of this over a normally poisoned blade, is the poison will never dry out and the first save [DC]] is 7 bigger than normal.