So there are 4 types of “standard” summon:
- Elemental summon - 3-5 star, specific color only, but regular heroes, with increased chance of scoring 5*. Gems only
- Epic summon - 3-5 star, all colors, and also regular heroes only. Epic Hero Token allows you to get it.
- Troops - 3 or 4 star only, available with Epic Troop Token
- Normal - 1-3 star heroes or troops, regular heroes only. Summon token allows you to get it for free, also daily token available. Doesn’t give you chance for hotm.
For 4 days in a month, Atlantis summon is available (as a 5th gate). You get 3-5 star regular + Atlantis heroes + chance of getting selected 2 past hotms.
During the event time (such as Pirates, Fables, Guardians, Avalon - or coming soon Wonderland) the elemental summon changes to Event summon. Same rules apply, so gems only and 3-5 star heroes with increased chance of 5*. Except all colors this time, and that there are event heroes available to be pulled as well. There is no other way to get these certain heroes (unless you win the event which you never will).
During seasonal challenge (such as Vale, Sand, Halloween or Christmas) the Epic summon changes to Seasonal summon Same rules apply as Epic summon, so you can get it with a gold token, 3-5 star only. Except there are few seasonal heroes also available to be pulled. There’s no other way to get these heroes except during the seasonal pull.
I hope it clarifies.
By the way I forgot to mention about Troop summons in my last post - edited to cover that as well.