I'll help you with the theme calling questions eccho since I created all the examples.
I've checked the "rules" again and now I wonder, is it a must, that a summoned unit is like a normal unit e.g, footman or it can be like an orb or something, e.g. orb that lasts 5 seconds on certain location and it shoots out fireballs.
Because I can't get any good ideas, by brainstorming myself with skeletons xP
The orb itself would count as a summon, but how the orb was deciding to shoot out the fireballs would determine if it fulfilled the AOE requirement. So, if the orb was randomly shooting out fireballs in the area around it, then it would qualify. However, if the orb was shooting it at specific units, it would no longer apply as AOE, as it is single targeting. In order for it to qualify as AOE, you would have to add in a second effect, maybe a blast wave on death that burns all units around the orb.
Also, looking at Kola's, normally just the arcane bolt targeting units wouldn’t make it an AOE. However, since the ward knockbacks units in an area around, and since the bolt continues past the target unit to units behind it, it qualifies as an AOE summon.
Is a block affecting an AOE? yes or coz units around are affected?
I’m having trouble understanding what the block is. If you mean only the summoned unit has the block, and the block works against all units around the summoned unit, then no, it is not an AOE. However, if the block is affecting all units around the summons unit, and all allied units around the summon block, like an aura, then it is an AOE.
~Asomath