End of Turn

Several effects state they happen "for __ turns" or last until the end of turn. Rarely will two effects happen at the same time -- it's more common for one effect to happen before the other. In some cases, order of effects matters; for example, the spell Impervious states it lasts 2 turns while Hive takes effect at the end of your turn.

Usually (but not always), this happens in the order the effects took place (so if Impervious was used before Hive was deployed, then Impervious would be removed before Hive took effect).

However, note that the game computes all end of turn damage, loss of life, and healing before it checks to see if the champion's HP is 0 or below. (Basically these effects happen "at the same time".)