A total of 450 hero shards are needed to get a hero to 4 stars starting from 0.
0 star: 0 shards, max hero level 60.
1 star: 10 shards, max level 80.
2 stars: 50 shards, max hero level 100, ultimate unlocked, skills can be leveled to rank 2.
3 stars: 150 shards, max hero level 125, skills can be leveled to rank 3.
4 stars: 450 shards, max hero level 150, skills can be leveled to rank 4.
5 stars: 1050 shards, max hero level 175, skills can be leveled to rank 5.
Image Credit: @FrenlyJo
