download whirlwind effect model on the hiveworkshop. this is basically so your leviathen thing wont have a little blademaster in the middle spinning.
1. attach the effect to the leviathan
2. play an attack animation and use a timer trigger to pause the animation so the weapon is horizontal...
increase the expiration timer. the animation backswing time of the dummy caster in addition to the infernal cast time may have exceeded that 2.00 seconds. try removing the expiration timer first to see if it works.
can't see much wrong with that trigger, but if your problem is that sometimes it randomly doesnt work, i think it's very likely you have conflicting spells. say for example your glacial storm is based on warstomp and you have another spell on your hero based on warstomp, then they will conflict...
usually if something is facing east it means 0 degrees, the default for any trigger action that somehow cannot acquire an angle. i dont recall or use "casting unit" as a reference in any actions for triggers, referencing triggering unit seems to be the most problem free, instead of casting unit...
your event is wrong in the fact that it causes the units to not be revived. with your event, you can still move the units around and such, but a unit does not actually become revivable the moment they die, it's a few seconds afterwards. therefore when the actions run with that event, everything...
it will only lag if you do not destroy the special effect afterwards. lag is only caused by memory leaks, almost all of which can be removed using custom scripts.
and make sure you remove unit group leaks with that, otherwise your map will get slower and slower with every spell cast.
if you don't know how, just google warcraft world editor memory leak
if i remember correctly, there is an event for "unit finishes training a unit"
that would be the triggering unit. the unit that comes out is the trained unit.
i think he means stacking the item abilities together, rofl. something like, a +1 str item and a +2 str item together gives +3 str. either way, i stand by my point that you must create a new item for every single combination ^_^
lol that is a hell of a lot of work to ask people of. i suggest checking hiveworkshop for some terrain tools, there are some things they have there that can quickly generate a basic terrain for you.