Follow the changes.

Applies Corrosive poison to all affected units. Other attack modifiers will affect only the primary target

Level 3: Blue Dragon: Attacks also apply a Frost debuff, which pierces Debuff Immunity and slows attack by 50 and movement by 30%

Splash attacks apply Corrosive poison and Frost slow to all affected units. Other attack modifiers will affect only the primary target

Bonus Move Speed increased from 20 to 25/30/35

No longer provides bonus attack damage

Now also increases cast range of all abilities by 350

Doesn't affect items

Aghanim's Scepter no longer improves Wyrm's Wrath effectiveness while in Dragon Form

Aghanim's Scepter Black Dragon stats slightly rescaled

Level 4 Black Dragon has the following stats: 40 Bonus Move Speed, 35 Corrosive Damage, 100% Splash Damage, 350 Splash Radius, 65 Attack Slow, 45% Movement Slow, and also provides +20% Magic Resistance and free pathing

No longer has an Elder Dragon specific cast range

Damage per second increased from 75 to 85

Duration decreased from 8s to 6s

No longer levels with Nothl Projection

Armor Change per stack rescaled from 0.5/0.75/1/1.25 to 1

Duration changed from 8s to 6.9s + 0.1s per level

Now upgraded with Aghanim's Shard

Applying a stack of Weave on an ally heals them for 60 per stack of Weave, including the stack that was just applied

No longer does a hard dispel on Dazzle when projection ends

No longer upgraded with Aghanim's Shard

Level 10 Talent +0.4s Rocket Flare Slow Duration replaced with +1.5 Mana Regen

Level 15 Talent +2 Power Cogs Hits To Kill replaced with -10s Hookshot Cooldown

Level 25 Talent Debuff Immunity Inside Power Cogs replaced with 3 Rocket Flare Charges

Now also allows Clockwerk to consume Chainmails to gain +4 armor per Chainmail consumed

Mana Cost decreased from 90 to 75/80/85/90

Clockwerk can now move freely through the cogs, sinking them down while walking over them. Other units can also walk over sunken Power Cogs

Mana Cost rescaled from 70 to 60/65/70/75

Mana Burn increased from 35/70/105/140 to 35/75/115/155

Duration increased from 13s to 18s

Now also increases Battery Assault radius to 330

Now also increases Power Cogs radius to 330 and provides 25% bonus armor to Clockwerk while he is near cogs

No longer increases Clockwerk's attack speed while inside Power Cogs

Now increases Rocket Flare damage, vision and slow duration by 35%

No longer decreases Rocket Flare cooldown to 3.5s

Duration improved from 10s to 8s

Number of explosions (hence, total damage) is unchanged, explosion interval decreased from 0.25s to 0.225s

Minimum Base damage increased by 4

Damage spread decreased from 10 to 6

Damage at level 1 increased from 40–50 to 44–50

Level 15 Talent changed from facet specific to +100 Teleportation Barrier

Level 25 Talent 3x Treant HP/Damage no longer affects Spirit of the Forest Multiplier

No longer levels with Wrath of Nature

Tree Radius rescaled from 300/400/500/600 to 300 + 10 per level

Multiplier per treant increased from 1x to 2x

Treants also have Spirit of the Forest and gain bonus damage for each nearby tree and treant

Vision increased from 250 to 400

Treant Movespeed rescaled from 305/310/315/320 to 300/315/330/345

Treant Health decreased from 550 to 450

Treants now have 25% Magic Resistance

Treants now deal 4/8/12/16 bonus damage to enemy Heroes

This bonus is also affected by the Treant Damage multiplying talent

Treants now have free pathing through trees

Base Damage increased by 10