Spawnmob effects

[SmrdutyOrangutan]

Hey everyone,

I would like to spawn a mob with a fire resistance potion effect. I've checked the website and I could find only this argument without further explanation:

effect-levitation/10/1-speed/10/2

Unfortunately, I don't know what does the numerical value mean. I tried the argument ingame and didn't notice anything unusual about the mob.
Second, I tried to change "levitation" for other effects, nothing happened.

Is it even possible to have any effects?

Thanks

Edit: The correct command should be

/cmi spawnmob husk:effect-fire_resistance/999999/1
Where husk can be replaced by any mob.
999 999 for infinite duration
1 for a potion level