[quote=@Muttonhawk]
Oooh, oooooh. Important question, [@Lugubrious]. Did the white giant in your post get properly killed, i.e. did the siphon in its core get ruptured? If so, there may be a magical explosion with random effects.
[/quote]

It was not.  The Ashling was going after Slough in an attempt to kill a huge source of natural life; the White Giant was just an obstacle, and once it couldn't fight anymore it prioritized Slough.