| Category | Events |
| Location | Bal-Kriav |
| Period | 1355 HE - 1555 HE |
Thyrms Breath are periods of intense cold, minor ice ages lasting decades to centuries. One of these periods of intense cold spanned the period 1355 HE to 1555 HE. Affecting an area of Bal-Kriav known as Midreth, it led to great loss of life.
In the first of Bal-Kriav's minor ice ages, the so-called Thyrms Breath, a highly advanced people named the Durkoth would disappear. Scratch coral from a sahuagin slave, found at Limac-Nîr, read 'The masters, the Durkoth, descended into the guts of the city, sealing themselves away.'
An advanced people, aliens of a world lost to the mind flayers, they are either sleeping in deep ocean vaults or departed for a more stable world.
- Hjarkmik, sea titan historian of Skuttirk - "Durkoth Hibernation"