Guaranteed Level 25 Rune - Middle Earth: Shadow of Mordor

For the "A Mighty Doom" trophy (Acquire a level 25 Rune) To get a level 25 rune, find or make a warchief level 20 (let him kill you and/or death threaten him). Additional rune levels come from being a warchief (+2), death threat (+1), knowing weakness (+1) and revenge kill (+1). Don't use his fear/hate (+1) or you will get a level 26 rune. Make sure betrayal isn't a fear or hate of this warchief. Brand some of his bodyguards and let one betray him. Make sure he gets killed by a bodyguard, and not by you, or he could drop an epic rune which doesn't count for the trophy.