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Resources in Legion are Mana and Soul Shards for all specs--too confusing having so many different ones. There are several talents for Soul Shards.
Incentives to use greater variety of Demons, and some are stronger for each spec. Affliction favors Felhunters, Demonology Felguards, Destruction Imps.
Demonology is now a completely pet based specialization with a handful of new abilities and some old ones that got reworked.
During combat, you concentrate on summoning pets and increasing their damage with $1 Demonic Empowerment.
$1 Thal'kiel's Consumption is your new artifact ability that drains 10% health from all your pets and minions and deals equally much damage on the target.
$1 Call Dreadstalkers summons 2 Dreadstalkers that fight 12 seconds for 2 Shards.
$1 Hand of Gul'dan summons now 1 Imp for each Shard that you spend.
$1 Demonic Empowerment increases the health and haste of your active demons by 50% for 12 seconds.
$1 Demonwrath is castable while moving and brings your demons to crackle and deals around 6,000 damage in a 10 yards radius.
Affliction Warlocks now focus on DoTS as primary source of damage, instead of damage dealt as you channel or use other filler spells.
5 instead of 4 Shards.
We get a new ability called: $1 Reap Souls.
$1 Haunt became a talent and $1 Unstable Affliction costs now 1 Shard.
$1 Drain Life is the new filler spell.
Dark Soul got removed and instead Doomguard's cooldown got decreased to 3 minutes.
$1 Grimoire of Supremacy allows you now to use a permanent Doomguard instead of improved pets.
Destruction Warlocks have the following major changes:
We get a new ability called: $1 Dimensional Rift (3 charges, 45 seconds cooldown)
$1 Conflagrate and critical strike ticks of $1 Immolate gives us $1 Soul Shards.
$1 Chaos Bolt (2 Shards), $1 Rain of Fire (3 Shards) and $1 Summon Doomguard (1 Shard) are your Shard spender.
Dark Soul got removed and instead $1 Summon Doomguard cooldown got decreased to 3 minutes.
$1 Grimoire of Supremacy allows you now to use a permanent $1 Summon Doomguard instead of improved pets.
Raid-wide buffs are removed in Legion and only healers can mass-resurrect.