Dark Tower Shards

The soulstone for these Digimons can only be obtained by collecting 100 pieces of their shards, which are only obtainable from the Hard Mode of Dark Tower. There are 60 Stages in the Dark Tower, and each stage will give you at least 2 Chests after defeating its Boss. Each chest contains 1 Shard, from which you can choose your desired Digimon. Completing all 60 Stages will give you 200 Chests in total.