attacking level 6 through level 10 Goblin Camps. Higher level Goblin Camps and higher level Sage's Tower give you an increase drop rate of relics. However, you will not obtain relics if you don't kill all the troops or don't kill any troops at a camp.
1) 100 Second City Relics can be exchanged for a Second City Deed Sage's Tower.
2) 100 Third City Relics can be exchanged for a Third City Deed Sage's Tower.