Rightmost Orb selection

Darkness creates a Dark Orb and triggers the passive ability of all Dark Orbs. Its upgrade triggers those passive effects twice. That supports stored damage, while Dualcast provides a way to spend the damage on the rightmost Orb.

Do not assume Dualcast selects the oldest, leftmost or largest Orb. The current sequel text explicitly says rightmost. Channeling another Orb before the Evoke can change the target. Read the slots immediately before playing the card.

Dark Orb setup turns

Dark damage must grow while the deck survives. A large stored attack is not a defensive plan, and a fight with several enemies may make the target of the eventual effect important. Preserve ordinary Block and a way to finish targets while the Orb develops.

The Defect character guide compares slot management with ordinary card damage. Use the actual Dualcast upgrade changes when budgeting Energy for the finishing turn.