Location of Event of 24 Seeds 2070: 142.376452851 2.64406510252 LAT 2 38' 39" N LON 142 22' 35" E Elevation 1933m (in sky above ocean)

Location of bluestar's lake tower: 145.196643691 6.21550399545 LAT 6 12' 56" N LON 145 11' 48" E Elevation 380.0m + 40.30m latd: 772883 lond: 610346.2068431429

disy 984.8200972242659 km

Location of crooked tower: 147.72735286 5.11719995569 LAT 5 07' 02" N LON 147 43' 38" E Elevation 312.6m + 23.40m latd: 535247.6878598473 lond: 1157732.418948162

dist 1275.474 km

Location of EPU detector experiment: 148.408681705 2.52533343609 LAT 2 31' 31" N LON 148 24' 31" E Elevation 30.70m +1.200m. latd: 25768.260917017662 lond: 1305001.8673499092

distance: 1304.256 km

MSL radius of equus: 12400000m

Recorded flux at bluestar's tower: 7.280 +/- 0.003 gigastarswirls

Original flux: 2.7189 ekastarswirls

True flux at bluestar's tower: 10.875 gSS. Distance: 500.015 km

True flux at Eastern Ponyland university: 6.0705 gSS Distance 669.246 km

Distance of Crooked tower. 651.95 km Flux 6.3969 gSS

Element of Honesty
    Location: The LIMINAL KEEP, under the Lake of New Canterlot.
    Power when Corrupted: False divination (tending to drive seers to despair)
    
    The element is kept with equipment to facilitate scrying in the dome of the
    Liminal Keep, Bluestar’s sanctum sanctorum. Access to the Liminal Keep
    requires exploration in New Canterlot, including possibly talking to NPCs,
    and figuring out how to access the keep (involving the hidden water level regulating 
dam. Bonus points for not draining the Lake.)

Bluestar himself found the Element in the periapocalyptic period and kept it in his
secret fortress. He knew of, and wrote about, its corruption. His journal, explaining
that the element is corrupted, can be found in the Liminal Keep, in his quarters.

After the Element of Honesty was lost by its bearer, it was found by sea ponies and brought to the archmage of the Isle of Yore, Bluestar the Brillant, for safekeeping. Bluestar recognized that the element had been corrupted, and, lacking awareness of the means to purify it, he kept it safe. First in the Lake Tower, and later, in the Lacustrine Keep. The Lacustrine keep is a keep built on top of the intake tower of the dam. Access to it is only by underwater.

Distance of 820 N mass on the lever  = 2.39x10^-2 times depth of lake

The Lacustrine keep regulates the water level of the lake. The magical cloister was permeable to air and water vapor, although not to liquid water, and consequently the lake would have evaporated or leaked out of the cloister field eventually. (When the cloister was active, the lake was dry exterior to the cloister, although moist in immediate proximity to it due to slow leakage of unusually fast-moving water molecules.) It contains a magical portal, remotely controlled by a pressure sensor in the powerhouse. The portal is connected to the abyss, and admits water but not salt, and is powered by the dimensional prison created by the Dread Pantheon, which Bluestar discovered. (He powered the cloister in the same way.)

The dam was outside the cloister. The magic portal stuff is in the old powerhouse, injecting the water into the system (reverse of the direction it used to travel. Opening the valves at the bottom of the turbine will drain the lake into the lake parish.