Storm - The announcer tells everyone "A storm approaches," followed by around 20 - 25 lighting strikes on random positions in quick succession.
Blizzard - The announcer says "A cold wind is blowing forth," soon afterwards, 3-5 waves of ice storms roll across the center of the map.
Increased Fog - The announcer says "Blackout!," Every players base vision radius is set to 5 for the next 2 minutes, reinforcement and structure vision radius set to 3, the only things that can see normally are Totems of Revelation.
Earthquake - The announcer warns "The ground trembles!" The map begins shaking around, lowering movement speed by 20%, and interrupting everyone every second, in addition, structures all take 100 damage every second. Earthquake lasts 18 - 23 seconds.
Blind rage - Your attack speed is increased by 25%, and weapon damage by 100, movement speed increased by .5, damage taken is lowered by 15% for 12-15 seconds, during this time, you have no control over your demigod, who runs to attack anything nearby, or runs to find something to attack. You cannot control minions either, but they will follow you as normal unless they were told to stay somewhere beforehand.
Barrage - The announcer says "Incoming Barrage!" Every demigod has 2-3 waves of trebuchet rocks dropped over their position, each wave coming in one second intervals and consisting of around 15-25 rocks. The barrages take a moment to land, allowing those who move upon seeing them to get out of most, if not all, of the damage.
Hurricane - The announcer says "The wind has picked up!" Wind immediately starts blowing, blowing all smaller units off the map, and lowering movement and attack speed by 20%, in addition, targetting cursors move back and forth as they are blown around. Lasts around 22-30 seconds.
Mass Transporation - The announcer says "Transportation!" All demigods are transported into the opposite team's base for 12-15 seconds, afterwards, they are all transported to the middle of the map.
Reinforments - A portal opens beside you, bringing in 40 soldiers and 10 archers that immediately run to the enemy base. Base health for all of them is increased by 1.5x, in addition to any upgrades purchased from the citadel.
Flag wipe - The announcer says "Flag wipe!" ALL flags are turned neutral, even the ones in your base.
Supplies - A potion and mana scroll are dropped beside you.
Well, this is all i could think of for the moment.