This achievement can be only unlocked every three weeks during a Raid Boss event. (Every week you either get Guild Wars, Raid Boss or Invasion)
You need to be in a guild to enter the event!
Check the Guild screen to see when the next Raid Boss event starts.
To get to the boss, you have to go through four stages. The boss is the final stage. The damage dealt to him adds up over multiple battles.
The stages in the first Raid Boss event (starting February 26) are:
Stage 1: minions (4 battles)
Stage 2: Moloch (1 battle)
Stage 3: minions (4 battles)
Stage 4: Abhorath (1 battle)
Stage 5: Icy Zuul'Goth - BOSS battle
To fight these battles, you need sigils, one sigil per battle. How to get sigils:
- you receive 4 sigils for free each day (you can wait for the last day of the Raid and use them all or play a few battles every day)
- you can buy them in the Raid Boss shop for gems - tiered rewards, 1st tier gives you 2 sigils, 2nd gives you 3 sigils etc.
- you get them from Valravens (troops appearing randomly in these battles), 2 sigils per Valraven. Valravens are fairly common, appeared in almost 50 per cent of the battles. Just kill them before they fly away.
The boss is stronger in each battle. You need to deal 80 damage to him to kill him in the first battle, 90 in the second battle, 100 in the third etc. The battles are not particularly difficult, provided you:
- have a good level hero and a good hero weapon (you don't need to use a hero, but your hero can be used no matter what his/her class)
- have leveled up the troops for the given kingdom (you can only use troops from a particular kingdom)
- VERY IMPORTANT: have a troop that gets extra damage against bosses (this week it's Xiong Mao, can be purchased as tier two reward in the shop for gems).
The achievement will unlock upon completing the battle in which you reached a total of 505 damage. So if you beat the boss every time, it will be at the end of the sixth boss battle.
You can see how much damage you have dealt to the boss in the Overview tab of the event.