Evo.

Galadriel raised Dol Guldor to the ground, further more, I don't want to remove Saruman from Isengard just because he didn't fight, but to make him the ring hero of Isengard  as well, with such a replacement I think its a good trade.

Spellbook

5PP
Crack of Doom

Summons a patch of cracked, volcanic earth. All units inside of it take damage over time. 
Watcher of Morgul

Summons a Watcher of Morgul. Can be placed anywhere on the map. Detects stealthed units. Nearby enemy units lose all leadership. 
Orc Horn
10PP
Barricade
He Is Gathering All Evil To Him

Summons Haradrim Raiders, passively unlocks Easterling Kataphrakts and Easterling Swordsmen
Call the Horde
Slaves of Nurn
15PP
Dungeons of Dol Guldur
Darkness
Wraiths on Wings!
25PP

The Eye of Sauron 

Sauron gazes upon the battlefield. Briefly stuns all enemy units on the map. Enemies caught within the Eye are stunned for longer. Friendly units caught within it are buffed. 
Fires of Orodruin 

Burning rocks and ash pummel the battlefield.

I really like the new spells, I had an idea of making an earthquake from mount doom as 4th tier spell but this one sounds better, some might prefer keeping Eye of Sauron in 1st tier because this iconic spell has been in Mordor's 1st tier since bfme1, but I don't think that is an issue here, this way the spell is an excellent reference to the Black Gate clip from Return of the King and portrays Eye of Sauron as much more dangerous and menacing spell than before, although I would suggest to add this:

1- Enemies caught within the Eye loss all leadership

2- Friendly units caught within it are fearless

3- Making the radius of the Eye bigger (as much as "Wrath of Caradhras" for example) but the player can't move the Eye

4- Replacing the voice line of the spell

    Currently its this: https://youtu.be/y4CVxSGPWyo

    I recommend this: https://www.youtube....h?v=G11prumD2pY

    If you find it long then just the part "I see you" is enough, I think it sounds more terrifying with the effects and fitting for the final spell.