At Hero Wars Guide you can easily keep track of all current and upcoming events.
You can also find some information about what type of quests these events have,
how many tiers at each type and the rewards you can obtain.
[Hero Wars Guide] Legacy of the Great Ones
Legacy of the Great Ones tasks
Legacy of the Great Ones Shop by calorifere
You should always complete the 'Level 200 Hero Artifacts' task. Make sure to save 100~200 Flawless Artifact Chests at the end for the next time this event comes around. That way you'll be able to easily earn 4,000 Event Points for 75k Emerald Coins, with which you can buy 400+ Flawless Artifact Chests.
One of the few events you need Artifact Chest Keys for, but you need 500 and the rewards are limited with only 2,000 Event Points. It might be better to save them for an other event.
You can pick up three free Absolute Artifact Chests at the 'Valkyrie's Artifacts' advertisement on the right sidebar of the screen each day of the event.
[Hero Wars Guide] Ascension to Asgard
[Hero Wars Guide] Ascension to Asgard All Quests
The only way to earn extra Eternal Seeds is with the Ascension to Asgard event quests.
[Hero Wars Guide] Guardians of Outland
[Hero Wars Guide] Guardians of Outland Tasks and Rewards
The 1,000 Hero Soul Stones are a lot for only 91 Skin Stone Chests and 21,150 Outland Coins.
Save your Soul Crystals for a better event, but if you can complete it with dolls and such it's a nice bonus.
Aside from that, the event has become much more expensive than it used to be. Before the update, completing the quests required just 50,000 Emeralds — which was already more than enough. Now, you need not only 253,000 Emeralds, but also 21,000 VIP points if you want to fully clear the event. Oh, and did I mention the Energy requirement went up from 12,000 to 20,000?
This event is far more expensive than it's worthwhile.
[Hero Wars Guide] Weaving Patterns
[Hero Wars Guide] Weaving Patterns All Quests
You need 250 Summoning Spheres for this event.
This will give you 98 Equipment Fragment Chests and 200 Golden Thread as rewards.
It’s also a good time to use your Artifact Chest Keys — you’ll need either 80 or 200 of them.
Using 80 keys gives you 210 Wish Crystals, which are always worth getting since they’re scarce ascension materials.
Completing the quest requires 120 more keys (for a total of 200) and rewards another 700 Golden Thread.
Opening 120 chests in the Tower costs over 6,000 Emeralds, so it’s not worth it — just clear the Tower daily as usual to open 45 chests naturally.
Spending 11,000 Energy rewards 48 Soul Crystals. These are valuable since many events now require Hero Soul Stones, and there’s an additional 200 Golden Thread at the end of the chain.
If you complete the Login, Summoning, Artifact Chest, and Energy quests without spending extra Emeralds, you’ll finish exactly 40 quests — enough to claim 4 Chests of Patterns and another 650 Golden Thread from Hero’s Rewards.
And don’t forget to click Weaving Patterns in the right-side advertisement column for extra daily rewards!
[Hero Wars Guide] Seer’s Game Tasks and Rewards
[Hero Wars Guide] Seer’s Chest
Gather as many Seer’s Coins as you can before you start playing—ideally, wait until the third day and collect all login rewards. If you draw a Cursed Card, you can continue after paying a penalty, which means you’ll need more than the initial 25 Seer’s Coins if you’re aiming for the bigger rewards or a full win. Completing all 30 rounds usually results in about 3–4 Cursed Cards on average, so plan on needing at least 275 Seer’s Coins. If you’re short on coins but still wish to continue, use the Esc key to exit the event or simply restart the app to return to the main square. Once you’ve gathered enough Seer’s Coins, you can resume drawing cards from where you left off.
Area of Conquest | Nexters - Hero Wars: Dominion Era
[Hero Wars Guide] Area of Conquest
Olympus : Hero Wars Area of Conquest (AOC) Calculator
[Hero Wars Guide] Hero Upgrade Chest
"Please note that the event and its quests will disappear on February 14, 2 AM UTC. Supperior Coins, Speed Boosters and Health Potions will be exchanged into Hero Upgrade Chests shortly after the event ends and sent to you in the mail:
1,800 Superior Coins / 3 Health Potion = 3 Hero Upgrade Chests;
4 Speed Boosters = 4 Hero Upgrade Chests."
However, you should use the Superior Coins to upgrade our Guild Castle if you have more than 1,800 of them. Even at higher levels, it only takes around 60,000~70,000 Superior Coins to upgrade the Domination Castle. If every guild member puts in 1,800~2,400 coins, we’ll reach a new level. This rewards 5 Hero Upgrade Chests (or 15 if you bought the Golden Ticket) for every guild member. If you decide to keep those 1,800~2,400 Superior Coins for yourself, you’ll only get 3~4 Hero Upgrade Chests — so being greedy (or lazy) costs not just everyone else resources, but you too!
The centre of the Area of Conquest map can be roughly described as a clock. You can use this to share tactics and targets more easily in the event chat.
[Hero Wars Guide] Hero Tournament of Power
[Hero Wars Guide] Hero Tournament of Power Tasks and Rewards
[Hero Wars Guide] Hero Resource Chest
(HWC) What's In the Hero Resource Chest | Hero Wars Dominion Era
Don't bother with the Halls of the Old Ones event quest, save your materials for the Ascension to Asgard event as it gives Eternal Seeds as rewards. Crystal Depths (spending Emeralds) and Reasonable Expenses (buying VIP) don't seem to be worth the money either.
The Long Road (energy quest) is okay. It overlaps with other events for double rewards.
Secrets of the Glyphs (upgrade hero's artifacts) and Elegant Power (upgrade hero's skins) are fairly easy to complete. If you spread these tasks over the 5 days you should be able to obtain the daily rewards each day. Unless you're aiming to win, save your resources and only do enough to get those daily rewards.
If you really want to score points in this event, the cheapest way isn't any of these quests. It takes less then 484 Huge EXP Potions to level up a hero from level 1 to 130. If this is a max star hero you will increase your total Hero power with over 17k. If you also use your Grey/Green/Blue junk items to level up this hero to Purple it increases even further. So without using any valuable resources you can earn over 25k per hero.
[Hero Wars Guide] Emerald City
Olympus : Emerald City Event Guide
Emerald City is a massive pay to win event, just ignore it and continue to play as usual.