Descriptions of the Chaositech items the party has found:

Needle Bomb

Tiny needles spray outward in 10’ radius, dealing 4d8 piercing damage to all in the area, DC 12 Dex save for half damage.

Bomb of Binding

Organic sticky strands explode in a 10’ radius.  DC12 Dex save or be restrained.  Once restrained, DC12 Str check to remove self, or, 10 points of damage to AC10 target to cut through.  Others move through the area as difficult terrain.  The strands last 3d6 minutes.

Bomb of Freezing

Freezes all moisture into a 10’ cube of ice.  Any creatures in that area are also frozen unless they make a DC15 Dex save.  Any creature inside is incapacitated, with the exception of making DC 20 Str checks to try and break free.  The cube has 20hp and is vulnerable to fire damage.  Each round a creature is contained in it, they take 2 cold damage.   The cube lasts 1d4 minutes, until it looses cohesion and collapses all at once.

Smoke Bomb

Creates a cloud of opaque, oily black smoke, for a radius of 20’, lasting for 1d4+4 rounds.  Heavy wind will disperse in half that time and move the cloud 10’ per round.   All within the cloud are considered to have total cover and be affected as though they were blinded.  No save.

Drilling Spear

Looks like standard spear. The head, however, looks like a drill tip, and below that along the shaft is a small mechanism. When activated by a switch, the tip rapidly rotates with a drilling motion.  If set in motion, it must be used two-handed, and then inflicts 1d10 points of damage per hit.  

Arc Sword

A longsword with an overly large hilt and hand guard, on which is an obvious button.   Wires appear to snake up from the hilt along the blade.  When the button is held down, the blade crackles with electrical energy (chaotically; not with the smooth glow of an arcane weapon).  When the wielder hits with the sword, he may use a bonus action to depress the button, dealing and additional 1d6 lightning damage.  

Ooze Dagger

A dagger that has small grooves running up the flat sides of the blade.  An activation switch in the hilt causes a thin stream of a caustic ooze-like substance to flow onto the blade.  As a bonus action, the wielder can turn on this stream after a hit, dealing an extra 1d6 acid damage.   Additionally, the ooze from the dagger can be used to burn through surfaces by allowing the acid to flow onto them, but note is does not dissolve metal.