User blog:Care Level/Fucking Sightstone, Man.

Builds into 3 Mythical-tier items:

Eyes of the Watchers:

 * Recipe: Sightstone + Frost Queen's Claim + 300g (total cost 3300g).
 * 65 AP. 20% CDR.  15 mp5.  4 gp10.  200 health.
 * Unique Passive: Tribute: Your next damaging ability or autoattack against a champion or structure will deal 15 (+10% AP) additional damage, slow your affected foes by 25% for 1 second, and grant 10 gold. You generate one charge of Tribute every 10 seconds, storing up to 5.
 * Unique Active: Overwatch: Consumes a charge to place a Frozen Standard that reveals the surrounding area for 3 minutes. When placed, nearby foes take 50 (+5 per level) (+ 20% AP) magic damage and are slowed by 80%, decaying over 2 seconds; while the ward persists, enemies passing through its radius are slowed by 15%.  A player may only have 3 stealth wards on the map at a time.  You generate one charge of Overwatch every 60 seconds, storing up to 5.  Charges are instantly replenished upon visiting the shop.  (5 second cooldown, 850 range, 225 radius)

Blessing of the Ascended:

 * Recipe: Sightstone + Talisman of Acension + 300g (total cost 3300g).
 * 20% CDR. 15 hp5.  15 mp5.  3 gp10.  200 health.
 * Unique Passive: Favor: Being near a minion without dealing the killing blow grants 3 gold and heals for 15 health.
 * Unique Active: Radiance: Consumes a charge to place a Standard of Ascension that reveals the surrounding area for 3 minutes. When placed, nearby allies gain a +40% movement speed boost for 3 seconds; while the ward persists, allies passing through its radius gain 15% bonus movement speed.  A player may only have 3 stealth wards on the map at a time.  You generate one charge of Radiance every 120 seconds, storing up to 5.  Charges are instantly replenished upon visiting the shop.  (5 second cooldown, 850 range, 450 radius)

Heart of the Earth

 * Recipe: Sightstone + Talisman of Acension + 300g (total cost 3300g).
 * 20% CDR. 15 hp5.  15 mp5.  3 gp10.  800 health.
 * Unique Passive: Spoils of War: Nearby allies' attacks and spells execute minions below 300 (+100% AD) (+120% AP) health. Whenever a minion is killed in this way, you and the killing champion and you gain 50 (+1% of your maximum health) health and grants them gold equal to the kill.  These effects require a nearby allied champion and consume a charge.  Recharges every 20 seconds for a maximum of 6 charges.
 * Unique Active: Steadfast: Consumes a charge to place a Standard of the Phalanx that reveals the surrounding area for 3 minutes. When placed, nearby allies gain a shield equal to 10% of your maximum Health for 4 seconds; while the ward persists, foes take damage each second based on the total AD and AP of allies in the ward's range.  A player may only have 3 stealth wards on the map at a time.  You generate one charge of Steadfast every 120 seconds, storing up to 5.  Charges are instantly replenished upon visiting the shop.  (5 second cooldown, 850 range, 450 radius)

Really, I'd be happy if Sightstone built into more things.