-Gather creeps near revive point may save some time.
-Right click "smart" may not attack the target, so use hotkey "A" instead.
-Hotkey "Ctrl+C" unlocks camera and reseted when revived.
-Get some mana before
-Don't move or drop items in battle, it causes hero to move randomly.
-Gem sometimes can't be placed, or placed but nothing happened.
-Don't use any ability to drop the gem. Hero can be attracted by shade and walk away.
-Q ability need to cast just face to the target to deal max dmg, but useless during boss fighting because it pauses the hero.
-W ability is great, especially after charge.
-Don't cast E ability, it's buggy.
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D charge's actual area is smaller than you think.
-Without abilities and items make him harder than the next two bosses.
-Bloodlust flurry has a long cooldown, and his attack dmg is lower than hero.
-Shade drops soul, but unit and doodad have collision size and likely to block you, so ignore them at first until they gathered too many.
-Keeping a short distance so he won't cast meak hook.
-When he was about to cast bloodlust flurry, walk away. Then back behind and attack him or clear shades. Melee attack is way more useful than Q ability in this fight.
-Attack at hero's max range, don't get to close or else hero can't run away from bloodlust flurry.
-Follow "Information for noobs"
-Attack wards and witch behind them. Samuel's charge is strange, he'll stun them first.
-When witch blinks away, just simply walk behind her.
-Could be the easest.
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Hero always just charges through Abaddon or simply stop but cause no stun. D**n! I have no idea how to deal with this.
-Carry angel set item to keep survive, demonic set is weak against him. Gems are important to restore.
-Main dmg is caused by R ability. Melee attack is not useful in this battle.
-You may drop items inside the battlefield if you want to chage items.
-When it's Spell 4 time, the 4 wards circle, clear wards with R ability at once. Before this, D charge to get mana and Q to kill some creeps, then walk circly. Restore as much health and mana as you can.
Also, death of some wards make other wards circles faster, don't take long when started to clean the wards.