User:DOORKEEPERSSON
Starlight Aura Cost Estimates
I've been trying to quantify SLA cost for spells. From my testing, the lowest SLA-consuming spell is min-cast CRD. I'm defining the SLA used by a minimum mana CRD as 1 "SLA bit."
With 700 Lunar Magic, my SLA pool is approximately 1,700 bits (meaning I could cast 1,700 2 mana CRDs without residue indoors before running out of SLA).
Most spells seem to ramp up their SLA costs pretty close to 1:1 with mana. So a 100 mana BLUR is roughly 20x SLA as a 5 mana BLUR. (Exceptions are Regalia which is always 15 SLA bits, and FLU which appears to be more generous in terms of requiring less SLA with higher mana.)
When regenerating SLA, pulses come every 90 seconds. It took me 85 pulses (2 hours) to go from 0 to 100%. This is around 1% SLA every 90 seconds, which for me was 20 SLA bits at the time of these tests (which again, was roughly 700 Lunar Magic).
Elison's SLA is per attack avoided, not per cast. Elanthipedia also says that amount of SLA depends on how thoroughly you win the contest. And while the creature I tested on did cause SLA drain every time, they were a tier below my normal hunting. So more difficult enemies probably have higher SLA costs.