Deepwinter 7 manifests his power, and nothing is noticeable except a sudden change to Ilan's arrows: they now glow with a pale silver radiance. It seemed that all Deepwinter 7 had to do to achieve this was concentrate.
Not even a second after that happened, three arrows zoomed in, most likely coming from the hobgoblin on the far right of the battlefield. Tristan is struck by two of them, though not too serious considering the speed the arrows were travelling: that Hobgoblin is a strong archer (7 and 10 damage for a total of 17, which puts tristan at 51 hp). It could have been considerably worse.
No one gets a chance to really react though, since just a split second after, Arcane words come from across the battlefield. Diactum strains to hear them, and with some luck he hears the words, deciphers them...too late! A fireball spell is cast, and a dimunitive ball of flame speeds to the exact center of the group of the heroes.
Ilan easily sees it coming, and takes cover to reduce most of the blast's effect. So do Deepwinter 7 and Tristan (these three take 12 fire damage). Diactum and Wulf however, are not so lucky. Diactum was still too busy deciphering the words of the spell when it hit, and Wulf hasn't even been aware that the party is in combat yet (and both take 24 damage as a result).
All horses but Deepwinter's also manage to stay away from the brunt of the fireball. Deepwinter 7's horse collapses under him, and is now dying (at -5. The other horses are at 7 hitpoints, except Ilan's Light Warhorse, which is at 10 hitpoints). Deepwinter 7 tries to come off his horse gracefully through his riding skills, fails horribly, and resorts to using his catfall psionic power (which is a free action) to land upon his feet and take only 2 subdual damage.
The offending mage who cast this spell on you seems to be the human. The rain feels nice and refreshing on all of your red skin, though the smell of the smoke coming off the dying horse is far from pleasant.
Hitpoint tally: Tristan 39, Ilan 46, Deepwinter 7: 66 (subdual damage = 2), Diactum 22, Wulf ?? (24 damage).
It is Wulf's first action: he has finally recovered from surprise. I guess the Fireball woke him up, eh

? (Do you still want to cast mage armour?).