Last request

 is a stash featured in S.T.A.L.K.E.R.: Lost Alpha. "I've seen it - the Bloodsucker King... Its beady eyes and tentacle-laced face salivating with hunger... I won't make it out of this alive. Please, to anyone who finds this: use this if if it helps you flay the abomination!"

- PDA description

Trivia

 * It is not unknown to receive the coordinates from a dead Ecologist in the Sarcophagus, at which point the only likelihood is to visit the area in Freeplay.