Drop the Top
From RoR Wiki
Drop the Top is a career-specific Tome of Knowledge unlock listed in the Tome Unlocks tables on the career Bestiary pages. The task listed for each career is to defeat the current highest-ranking player of that career. The table gives the related trophy and XP reward; the trophy differs by career.
For the career-specific entry, see the relevant page in the Bestiary. The trophy list is on Items (Rewards).