How to kill high level raid boss?

[hellotik]

I tried to kill level 36 red boss, but the damage is already more than I can heal with 50% reduction.
I won but if I was a bit less lucky, I would be killed.
How do people kill even higher level raid boss?
I saw some with level 40+.
It seems a long way to maximum level and I have no idea what cards to use...

[Jas0n]

Raid bosses are not suppose to be killed by yourself.

Raid Boss HP does NOT recover after you attack it.

Example: Lvl XX Raid boss has 10,000,000 HP

YOU Attack 1 time: 1,000,000 DMG - 10,000,000 HP = 9,000,000 HP Total
Friend #1 Attacks 1 time: 500,000 DMG - 9,000,000 HP = 8,500,000 HP Total
Friend #2 Attacks 1 time: 1,500,000 DMG - 8,500,000 HP = 7,000,000 HP Total
You Attack 2nd time (1 hour later): 1,000,000 DMG - 7,000,000 HP = 6.000,000 HP Total
Friend #3 Attacks 1 time: 2,000,000 DMG - 6,000,000 HP = 4,000,000 HP Total
Friend #2 Attacks 2nd time (1 hour later): 1,500,000 DMG - 4,000,000 HP = 2,500,000 HP Total
Friend #4 Attacks 1 time: 2,500,000 DMG - 2,500,000 HP = 0 HP DEAD.

EVERYONE who attacks get 1x Reward. Friend #2 did most DMG (3.5m) gets 2x Reward. Friend #4 KILLED Boss (Last DMG done) so he gets 2x Reward. YOU summoned Boss so you get 2x Reward.

RECAP:

YOU = 2x Reward.
Friend #1 = 1x Reward.
Friend #2 = 2x Reward.
Friend #3 = 1x Reward.
Friend #4 = 2x Reward.

This is how Raid Boss is suppose to work. Obviously people don't want to count on others in which you have to attack 4 times (1hr cooldown each attack and Raid Boss lasts 4hrs) and hope you do at least 25% damage per attack. (Using Healer/Reviver even if the Raid boss does 99,999 Dmg for example.)

I think most people do NOT understand how Raid Boss works so they only attack if they can SOLO (do 100% Dmg) or get LAST HIT.

[hellotik]

Thanks jason for the excellent explanation.
Guess you will need certain number of strong and active friends to take out a high level raid boss...
I just wonder if it is worth the effort.
Although the chance to get the boss card is lower for lower levels, but you are guaranteed to have 2x awards if you solo the boss each time.

[Midas]

But in whole - Jason described situation when one RB give 8 cards to players, and if you kill boss in single fight - he give only 2 cards. 4 if it wasn't your boss.
It's situation when sometime personal reward may looks bad, but for all players combined it will be better.