Valya peeks around the corner and with an incantation sends a searing spear of white light at the wyvern! She's keeping her bigger spells a bit closer at hand this time around, opening with a conservative cantrip.
(Move out from behind the wall, Ray of Frost, move back.)
[roll0] to hit, for [roll1] cold damage, and it reduces the wyvern's speed by 10 if it hits as well.