>Vampire
> A good fighter once it hits your program, but is 
> rather slow and kills itself.

@-230
.nprc
DAT 500       
.spin
SPL 0
DJZ 2,nprc
.trap
JMP -1
MOV null,trap
MOV #0,spin
.null
JMP 0
@ -2
.fang
JMP @1
.bite
DAT 1000
@ 0
.start
MOV #(spin-bite),@bite
SUB bite,@bite
SUB #1,bite
MOV fang,@bite
ADD #7,bite
CMP #500,nprc
JMP start
MOV #100,bite
.erase
MOV #0,@bite
ADD #1,bite
JMP erase