Purchasing 100 CL Packs directly from the Splinterlands site will award a 10% bonus (10 Packs). If you want to claim those 10 packs one would need to supply 10 Vouchers at purchase time. This is true for all bonus levels of bulk purchases of Chaos Legion Packs. There are other Splinterland assets such as Nodes in which Vouchers give a purchase discount to.
Edit: I should add that the new upcoming Splinterlands Tower Defense game does give purchase discount for Vouchers used. TD packs are 8,000 DEC without a Voucher or 5,000 DEC with a Voucher. The same bonus structure for bonus packs applied to CL packs also applies to TD packs.
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