Is there any date or timeline, even approximate one, on when did Allevrah turned drow or started her research on how to "copy" Earthfall?
The only solid thing I found about her, that she was for 4 years in Zirnakaynin, before she took over Azrinae House.
Hi Ashkar, there's nothing definite I've come across,and I suspect this is intentionally vague to allow DMs to fit it into their campaigns. Book 4 says after her transformation she fled Thorn's End. I'd assume she went pretty directly to the Darklands as she'd have nowhere else to go now, being a drow.
Most of her research on the abolethic magic would already have been done as she was intending to use this against the drow. Presumably the 4 years account for her gaining a foothold in drow society and building her power base, and then researching the last details of the magic (which is what Nolveniss was up to in Celwynvian and the Armageddon Echo).
