Beast of the Week: Slayer

Remember Krull?  The fantasy movie from, what, 83?  The one with the cool throwing weapon called the glaive?  The cyclops?  Gooseberry pie stealing polymorph scroll carrying wimpy magic-user dude?

The enemy army were called Slayers, and they were pretty cool.  Here's a stab at them going purely from the memory of having watched Krull numerous times (too busy to watch many old DVDs lately, although Krull is in the library).

Slayer
Armor Class: 3 (17)
Hit Dice: 1+1*
Move: 90 (30)
Attacks: 1 weapon
Damage: by weapon
No. Appearing: 1d6 (3d6)
Save As: Fighter 1
Morale: 8
Treasure Type: C
Alignment: Chaotic
XP:20

Slayers are symbiotic creatures used by powerful extra-dimensional entities as shock troops.  The Slayer consists of a bio-mechanical humanoid body, well armored and typically carrying a special spear-like weapon that can fire a magic missile, as the spell, once per Turn.  In melee, the weapon functions as a short spear.  Inside the domed helmet of the bio-mechanical body is a foot-long, intelligent, leech-like creature.  When the body (stats above) is killed, the leech breaks out of the helmet and tries to tunnel into the ground and escape back to its master's stronghold for a new body.  The symbiote is AC 3 (17), HD: 1/4, Attack --, but it is acidic and anyone grabbing one takes 1d4 acid damage.  Non-magical weapons that strike the symbiote are destroyed by the acid.  The symbiote can tunnel underground at an impressive rate, so usually escapes the round after the humanoid shell body is destroyed.  The extra-dimensional entities that employ Slayers typically have few symbiotes, so destroying the leech before it can escape is the only way to whittle down the entities' forces once they arrive in a particular world.