Holy relic gave 2500 ranking, the same as Barnie's book. This was the case until version 1.3 (German version). If this has changed in 1.4 => I don't know.
Lava => south of the library are bathing demons.
amulet => in Kiya's crypt, you have to survive her. Her entry is NW nexzt to the church.
About Holy relic again => billboard told you Raze wants it - go to Raze, he flags location - give relic to him afterwards - go to ranking book => really no XP????
All other questions are wonderfully explained in Hellfighter's maps.
