Entropy

Successful direct hostile spell hits have a 12% chance per rank to add your Festering Plague stack, up to four, once every 1.5 seconds.

Positive damage from your owned rot ticks restores 1 mana per rank, once every 2 seconds.

Necrotic Decay becomes Entropy Cascade: deliberately seed up to two secondary remnants, or one with Terminal Decay. Remnants cannot spread again.

When your Festering Plague expires naturally or you kill its infected recipient, seed one other hostile within 250 units with an 8-second Transmitted Plague. This child cannot transfer again. Each event kind can trigger once per second.

Once your Festering Plague has lived for 4 seconds, successful direct Plague Bolts deal 4 + 10% spell power extra Shadow damage, once per second. Refresh preserves infection age. Soul Collapse preserves your plague and instead adds 20 + 40% spell power damage. Cascade seeds one secondary instead of two.

Dread becomes Unnerving Terror — a fear that leaves a lingering rot after the target breaks, adding one more disease to the pile.

Successful direct Plague Bolts against your infection aged at least 4 seconds recover Soul Collapse by 0.5 seconds per rank, once every 2 seconds.

Essence Siphon becomes Soul Harvest — an AoE drain channel that withers every foe around you, feeding the cascade.

Successful direct Plague Bolts against your four-stack infection grant 2% damage reduction per rank for 4 seconds, once every 4 seconds.

Grasp of the Grave becomes Wretched Pull — a damage-focused grasp that roots its victim for 3 seconds so your rots run their full course.

Positive owned Collapsing Decay ticks add 2 Shadow damage per rank, once every 2 seconds.

CAPSTONE — burst up to five nearby hostiles and apply Collapsing Decay. Neutral and Pandemic spend your Festering Plague for per-stack damage. Terminal Decay preserves it and instead adds a smaller focused burst.