Some new ideas for items:

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1. Ignorance:

Favoritem:

Next time target uses a spell/consumable/ability etc, they are silenced for 3-->5 seconds FOLLOWING the casting of that spell.

2. Iron Mask:

Shop Helm: Cost 3200

While wearing Iron Mask, 2% of armor will be converted to damage 

ie if you had 3000 armor you would deal an extra 60 damage per hit.

Armor 500

Attack Speed 12%

3. Panic Stricken Gauntlet's

Item: gloves. Cost 2600

For each 3% health missing, attack speed in increased by 1% (would give you a total of 32% if you were at 3% health).

Item proc chance: 12% -- slow (12%) unit for 5 seconds

4. Oozing Armor: cost 3200

12% chance of striking all nearby units for 400 damage on weapon proc

Leaves an ooze trail behind the demigod which will slow (15%, duration 3) and drain mana (3%) for each second  enemy unit is on the ooze trail.

From Split-Shadow: Favoritem

5. Gravity Well

Speeds up the passage of time in the area where it is placed. Lasts for 30 seconds, has a 55 second cooldown.
All regeneration, move speed, damage over time abilities, attack speed, and cooldowns are increased for all nearby Demigods.

6.General Diversion:

Favoritem: Cost 550 mana

For 7 seconds, all damage to demigod is reduced to 0. This damage is reduced by 50% and dealt to each minion the general owns instead. Effect is cancelled when general has no 0more minions remaining.

7. Time Rift:

Favoritem: Cost 550 mana

Places a protective buff on friendly unit for 7 seconds. If that unit takes lethal damage then they take no damage and are transported back in time, healed for 20% of their maximum health instead.

8. Shadow Walk: 

FavorItem: Cost 400 Mana.

Demigod Passes through all units in flight path (will use code from batswarm), and will be healed 3% Health and Mana, for each unit it passes through. After Casting demigod will immediately return to their original position.

9. Time Bomb:

Wand: cost 2200

Range - 75 Same as snipe.

Cooldown 30

ManaCost: 300

On Use: Places a timebomb at given location (snipe animation, places a ward on the ground at given location that can be destroyed). This will detonate 4 seconds after being placed dealing 550 damage to all units in radius 14.

10. Alchemist:

Favoritem:

Enemies in radius 13 cannot use consumables.

7% Movement Speed

20% bonus health whenever you receive a heal (ie potion/sedna's heals/monks etc) 

11. Vampiric Mits

Favoritem:

Activate-able (similar to ooze): Each time demigod attacks they lose 1% health, however, each time the successfully land a hit, they will have their maximum health increased by 3.

12. Illusion Field

Boots: Cost 950

For every 1% movement speed you have (above 0) you gain 0.5% evasion.

13.  Fail Safe:

Consumable: Cost 400

ALL demigods in range 25 are teleported to their nearest friendly structure, (not flags) and interrupted

14. Eviction:

Consumable: Cost 450 

Range 15.

Cast time 1.2

Enemy demigod is teleported to their health crystal.

15. Broth of Battle:

Consumable: Cost 380

All cooldowns are reset

16. Spotlight

FavorItem:

After being hit (weapon Proc 100%), demigods will no longer be able to hide in the fog of war.

17. Team Player

FavorItem:

For every demigod allied demigod in Range 12 you will gain +35% health regen and +35% Mana Regen. Enemy Demigods in range will provide double this bonus.

18. Gargantuan Greaves

Boots: Cost 4800

Enemy demigods that strike demigod with Gargantuan Greaves (armor proc 100%) will have their damage reduced by 5%, movement speed reduced by 2% and armor reduced by 3% for 5 seconds. This will stack.

600 Max Health

800 Mana

19. Starlight

FavorItem

Enemies that strike demigod with starlight will have all cooldowns increased by 5% for 5 seconds (stacks). Additionally, ranged units that strike demigod with starlight will have their range reduced by 50% for 4 seconds (buff replaces itself).

300 Health

300 Armor