how does "cast on" work with multiple gems?

[rumpelstiltskin]

apparently energy cost = (socketed spell gem casting time) x 10. so if i put several spells into it, will they all trigger at once (unlikely sadly), or one after another if there's "energy" left after the first one (in which case the ones after the first will hardly ever trigger). can i put several spells into it at all? can i [only] put support gems into the remaining slots? and if so, will they modify the socketed spell or "cast on" itself (if it can be modified in a meaningful way, idk)? so many questions..

[Noodles]

Interesting. I have cast on crit with;

Skill;

- Comet

Support;

- Spell echo (spawns additional comets which shows support gems buff socketed skill gems)

- critical damage

- supercritical

I've never actually tried an additional skill so keep me updated. The required energy for me is just when it hits 100.

[Sir Loin]

I believe it just makes it take longer to reach the max energy if many spells slotted, and then all would trigger together at max energy.

[thawn4444]

all spells cast at once, multiple spells increases energy cost.


literally says this in the tooltip. . .

[Knavenformed]

Yes you can slot in more spells, their cast times increase energy needs and they will all cast when you hit full energy