What I believe champion mastery titles should be.

Assassin

• Prowler
• Stalker
• Cutthroat
• Slayer
• Reaper

Fighter

• Scrapper
• Bruiser
• Warrior
• Veteran
• Destroyer

Mage

• Initiate
• Apprentice
• Sorcerer
• Wizard
• Arch-Mage

Marksman

• Scout
• Pathfinder
• Ranger
• Hunter
• Sniper

Support

• Aide
• Bodyguard
• Defender
• Guardian
• Sentinel

Tank

• Grunt
• Thug
• Enforcer
• Titan
• Juggernaut

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Teal Deer, Reaper sounds more impressive than Slayer, fighter titles are ok, the mages' titles should be ranks, not specific classes, marksmen need to sound more deadly in the later titles, supports' titles needed to sound more important in general, and tanks' titles were just a freaking mess.