The head is fastened to a line so as
to secure the target creature to the wielder or some object, provided
the weapon strikes home. Against most targets, a hit from the harpoon
indicates that the barbed head is buried or snagged. (See aklys
above for details of this entangling effect, unless the harpoon line is
secured to some stout object.) Naturally, the line attached to the harpoon
must be of sufficient length to allow hurling to the range needed.
Furthermore, this line must be able to run freely when the weapon is
hurled (and possibly subsequently moved away with at great rapidity).
In general, the following guidelines can be used when dealing with
harpoon hits:

If the target creature has an intelligence of not less than 2, and likewise
has some means of effectuating dislodgement of the weapon
head or severance of the line, a saving throw versus poison is allowed.
Success indicates the victim has freed itself. Failure indicates
continued attachment, 1 point additional damage, and the possibility
that the victim will be dragged 1 “closer to the harpooner if the wielder
so desires and the victim is of a size, weight, and strength which enables the harpooner to do so (cf. kuo-toa in the FIEND FOLIO@ Tome).
 
 

Weapon Type	Approximate Weight in Pounds	Size S or M	Size L	Notes	Length	Space Required	Speed Factor	0	1	2	3	4	5	6	7	8	9	10
Harpoon	5-6	2-8	2-12	Harpoon	6-8'	11/2'	Harpoon	-3	-2	-2	-1	-1	-1	0	0	0	0	0

-

Weapon Type	Approximate Weight in Pounds	Size S or M	Size L	Notes	Fire Rate	S	M	L	0	1	2	3	4	5	6	7	8	9	10
Harpoon	5-6	2-8	2-12	Harpoon	1	1	2	3	-6	-5	-4	-3	-2	-1	0	0	0	0	+1