I hope they buff the Spirit of the Eldar Golem too with CDR. I run Spirit of the Eldar Golem on Sejuani and Volley Bear.

I personally jungle Pantheon a lot and I think that the Spirit of the Eldar Lizard is the strongest of the three Spirits.

I don't always build a Spirit of the Eldar Lizard, but I usually do and I kill things gloriously and in very manly ways.

The Spirit of the Eldar Wraith is just poor item slot stack up IMO. The AP is soo low. Other spell vamp items pack so much more bang for your gold and your slot.

A damage over time effect is one single effect dealing its full damage over a duration.

Darius' bleed is a Damage over Time.
Draven's bleed is a Damage over Time.
Cassiopeia's Q/W are Damage over Time.

Garen's Spin may deal it's damage over time, but as a channeled ability it is dealing six instances of damage individually over 3 seconds, not "hit once and then it will deal damage over 3 seconds."
Wukong's Cyclone is dealing 8 instances of damage over 4 seconds.
Amumu's tears are dealing one instance of damage per second.

So the trick is figuring out which count as "Damage over time" and which count as "Damage per instance over time"

Generally speaking, Damage over Time is fire and forget. Did the spell land? Then you get all the damages.

Damage instances require constant / sequential contact, such as Warwick's ultimate, the various Spins, and Syndra's ultimate.

Shyvana's Burnout also activates the burn on each tick.

Treat these abilities as multiple, separate hits.

I believe the 'damage-over-time' refers to stuff like Swain's torment and Malzahar's Malefic visions, stuff that's targeted and long duration.