Update: 2/7/2015 Once you have maxed a Smoke Signals, The Summoner or A Familiar Foe at level 15. The drops of scrolls from those Epic Battles would cease to drop ONLY for the equipment you maxed at Level 15.
Sometimes it's more about availability, less about being able to "man up" bud The ONLY war I'm not working on, is the 2am one, I ain't staying up until 3am
Some of the stats on relic equipment is laughable at best. Stats need to be readjusted heavily for the ammount of work to upgrade them. Not that id use that gear anyways even if it were upgrade by devs tho ️
Update: 2/20/2015 Have updated this thread. When you reach a certain achievement, the scroll drops for the other equipment in that Epic Battle would increase.