To get the bug information out there quickly, there is wonkiness with double roundtime for people afflicted by the curse. Also, the target cannot see the curse on them when using POWER. This is all shown in the log below.

Buff duration is 1-2 minutes at 20-25 mana. Seems a bit low, but then I saw the effect. Wow. Curse duration is around 30 seconds.

Zankul bows his head and chants a psalm.

Zankul opens his arms in a hieratic gesture.

A sheet of lustrous silver liquid snaps into being vertically in front of Zankul, its pristine surface animated with placid ripples and bubbles. He takes a single step through it, emerging to the other side unchanged but with company. As the silvery sheet is dragged along with the incomer, it wraps and defines the vaguely humanoid form of a faceless watchsoul.

> prep stam
Since you're not feeding enough power into the spell pattern to make it coherent, you quickly work your way to the minimum required.
That won't affect your current attunement very much.
With calm movements you prepare your body for the Stampede spell.
> targ zank
You begin to weave mana lines into a target pattern around Zankul.
> cast zank

You raise your right hand skyward and make a quick whipping motion.
The pounding sound of a multitdue of beasts quickly grows louder as multiple horses formed of a orange-hued energy come into view from somewhere seemingly distant, stampeding straight towards Zankul!
The horse leaves Zankul mostly unfazed as it bounces off him, the orange-colored energies quickly dissipating.
The horse leaves Zankul mostly unfazed as it bounces off him, the orange-colored energies quickly dissipating.
The horse leaves Zankul mostly unfazed as it bounces off him, the orange-colored energies quickly dissipating.
The horse explodes into an orange-hued mist as it impacts directly with Zankul's shield.
The horse leaves Zankul mostly unfazed as it bounces off him, the orange-colored energies quickly dissipating.

Roundtime: 1 sec.

R>
A faceless watchsoul near Zankul flies furiously through the air toward you!
The watchsoul spins in several quicksilver circles around you, then transmogrifies into what feels like an open flame licking at your face for a moment. You feel haunted.

> prep stam
Since you're not feeding enough power into the spell pattern to make it coherent, you quickly work your way to the minimum required.
That won't affect your current attunement very much.
With calm movements you prepare your body for the Stampede spell.
> targ zank
You begin to weave mana lines into a target pattern around Zankul.
> cast zank

You raise your right hand skyward and make a quick whipping motion.
A loud and drawling voice proclaims in your ear, "For your transgressions, Prydaen, you shall be interdicted from Meraud's Gift."
Your Stampede spell pattern disintegrates into smooth, soft lines of blue and gold -- bedeviled and voided by the specter.
Roundtime: 5 sec.

Roundtime: 1 sec.
R> pow
You reach out with your senses and see glowing (11/21) streams of deep green and blue Life mana flowing through the area.
Letting your senses extend further, you feel there is incredibly less mana to the southwest, and somewhat less mana to the northeast.
Roundtime: 5 sec.
R>
You feel a sudden vertigo as a faceless watchsoul departs your body and returns to Zankul's side.