Message
The right-hand side option of the Divine Temple costs 15 Pact Shards, and duplicating a spell with such an upgrade adds 10 Pact Shards. The options are: Twinstone, adding Spellchain (upon playing, add a copy of it with Purge and +1 cost); Valuestone, reducing the cost of a spell by 2; and Extremestone, giving a spell +30 damage.