Question

is it possible to find a sequence with the ruleadd four for wich
all terms are multiples of four and eight
all terms are even numbers
all terms are negative numbers
none of the terms are whole numbers

if so tell me the sequence our i will die


It's not entirely clear to me what you're asking here.
If all the terms are multiples of eight then they'd be multiples of four and even de facto. If you picked negative multiples of eight then it might satisfy your requirements. By 'whole numbers' do you mean only positive integers? If so, then the negative multiples of eight should work for your sequence.