Kill Father Diodor is an optional sidemission featured in S.T.A.L.K.E.R.: Shadow of Chernobyl.
Description[]
I always said business and religion can't go together, they can never cross, and should never ever meddle in the other's affairs. It's just this padre, Lord forgive me, Diodor... well... he just can't see this simple truth. He keeps raving about artifact hunting, says that trading in them drives people to sin not just in the Zone, but in the whole world, on and on along those lines. Get this, he preaches the destruction of artifacts altogether! See what he is up to? The worst bit is that he's actually got some converts! I've tried to approach this Diodor this way and other, but he just keeps at it. Here's the deal: you're going to send him upstairs where he can preach all he likes... you get the point, right? And I'll give you a cool artifact. So, we've got a deal?
― Sidorovich
Acquiring the mission[]
This is the last mission in the Sidorovich assassination quest line(Kill the "sales representative", Kill the rookie stalker and Kill the trader stalker) and is only available after the player has been to X18.
Completing the mission[]
Father Diodor is one of the Stalkers near the campfire in center of Army Warehouses and hangs out with Smartass and Master, so it's good to combine this quest with Kill master stalker and Kill the traitor.