There are a lot of ways to accomplish this, but it really depends on your current progression in the game.
Some ways to score 5* champs: Arenas + Rank rewards + Milestone rewards (PHCs) = duping as many 2-4* champs as fast as possible to get the max signature stone crystals to "roll up" shards Story/EQ/Side quests = will often have many 5* shards for rewards Calendar login = May provide shards to assist (progression based) Wars = Winning wars (based on tier) can net some 5* shards Purchases = Bundles, cards, units to buy cavalier crystals, etc
these are just a few examples. But again, this relies heavily on your current progression, roster, and alliance.
Are you trolling? Duping is when you get a dupe which means you unlock your champions ability, for example Blade duped can regen when holding block and below 70% HP and if not awakened he can't
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Some ways to score 5* champs:
Arenas + Rank rewards + Milestone rewards (PHCs) = duping as many 2-4* champs as fast as possible to get the max signature stone crystals to "roll up" shards
Story/EQ/Side quests = will often have many 5* shards for rewards
Calendar login = May provide shards to assist (progression based)
Wars = Winning wars (based on tier) can net some 5* shards
Purchases = Bundles, cards, units to buy cavalier crystals, etc
these are just a few examples. But again, this relies heavily on your current progression, roster, and alliance.
Everything else is determined by progression and RNG.
Duping is when you get a dupe which means you unlock your champions ability, for example Blade duped can regen when holding block and below 70% HP and if not awakened he can't