"B" is for "Blitzfin"

Blitzfin

No. Enc.:  0 (2d6)
Alignment:  Neutral
Movement:  0' (0')
     —Swim:  165' (55')
Armor Class:  7
Hit Dice:  2
Attacks:  1 (bite)
Damage:  1d6 (+1d8)
Save:  L1
Morale:  9
Hoard Class:  None
XP:  65

Blitzfins are 3'-4' long, silvery, carnivorous fish found in bodies of fresh- and saltwater (particularly near ruined dams and power plants).  Electricity continuously arcs along their bodies, and their teeth crackle with energy.

Anyone bitten by a blitzfin suffers the initial bite damage, and takes an additional 1d8 jolting damage (unless otherwise immune).  Furthermore, those immersed in water and targeted by a blitzfin's Energy Ray or Energy-Retaining Cell Structure take an additional 1d6 conductivity damage per attack.

Like shockroaches and drearwigs, blitzfins can be used as "living dynamos" by those with the technical expertise.

Mutations:  Energy Ray (Electricity), Energy-Retaining Cell Structure, Reflective Epidermis (Electricity)