This is the final version we went with:
GIFT OF THE CONFLUX [-4]
Description: Tapping into the Ley-Line construct in Nose Hill Park, you've managed to channel a portion of it's great energy...however now you are bound to be a keeper of that which sleeps beneath.
Sponsor: The Ley-Line Construct that holds a Formorian Giant.
Agenda: The prison was constructed to keep the giant imprisoned, and you are now responsible for keeping the prison secure. Occasional dark impulses favoring the Formor and it's release bubble up...but how bad could it be?
Evocation: The Gift of the Conflux Water magic in the form of the Formians. This includes magic of the deeps, like pressure as well as basic Water Evocations.
Thaumaturgy:The Gift of the conflux provides the ability to use Summoning and Binding Thaumaturgy.
Evothaum: Any Thaumaturgy cast with the Gift of the Conflux can be done with the speed and methods of Evocation.
Extra Benefits: The Gift of the Conflux gives a +1 bonus to Complexity and Power for Summoning and Binding. Additionally you may use your specializations when using Summoning and Binding at the speed of evocation.
Note: The Gift of the Conflux provides two sources of Sponsor Debt. When incurred using Binding and Summoning powers (at Evocation or Regular speed) debt is accrued with the Ley Line prison. When incurred using the Evocations, debt is accrued with the Formorian giant that is imprisoned.