is there a part where I can find what counter what (dunno, like a table?) and who can equip/use a trait or spell?
Anyone know if the ICD thing is datamined, someone unlocked it and kept time on the beta, or is it just rumors and what nots?
I would love to know to spam it asap or to wait for us to clear xyz then to do it to get the next upgrade
According to a post here
(unofficial, so I don't trust it 100%) the internal cooldown of the mission is around 2.5 weeks. I'm not sure how long this mission stays in your log, but I wouldn't wait for more than 3 to 4 days.
The tier of the Highmaul Cache depends on whether you've killed 15 bosses in a given difficulty. 15 Normal boss kills = Heroic Cache; 15 Heroic boss kills = Mythic Cache.
The Highmaul Raid missions unlock once you have 2+ ilevel 645 followers (make sure they're epic so they have multiple counters!), so plan accordingly!
EDIT: It seems like if you've already gotten a Normal/Heroic Cache this week and you happen to reach the 15 Normal/Heroic kills, the next tier cache mission will become available asap and you'd only get the highest tier of cache mission after.
All the highmaul raid missions last for 335 hours and, based on my exp, have a respawn time of 2 week so you can complete one every other week.
The reward level (norm/heroic/mythic): you need 15 kills on a diifficulty to unlock the next one: once you have 2 followers with 645ilvl (but ofc you need 3 to complete it anyway) you get the first step with normal (655 ilevel) reward; then based on your highmaul raid progression you get higher rewards:
15 normal kills -> hc reward mission (670ilvl)
15 heroic kills -> mythic reward mission (685ilvl)
Garrison Timer Mobile App
[Upon completion your 随从 will gain: ]
Highmaul Raid Missions Guide
Missions and Followers math for maximising success chance
Warlords of Draenor Garrison Missions Guide