Does Anivia's Frostbite synergize with other Champions?
Solution 1:
From Lol wiki
"ACTIVE: Anivia fires a shard of ice to deal magic damage to a target enemy. Frostbite deals double damage to enemies "chilled" by Anivia's other spells."
Anivia's E does not deal double damage to enemies "chilled" by Ashe's Arrow, but rather only enemies chilled by Anivia's own spells. In the past, Anivia synergized with other sources of chill, but these interactions have since been patched out.