Not to be confused with Poison Cloud

Units with this ability generate a green smoke effect either on the tile they occupy, or one of the eight tiles immediately surrounding them. Any unit caught in the effect accrues 2 points of AN nonmagical poison damage in its poison damage pool. The effect lasts for two rounds and stacks, meaning a unit exposed to the effect of three different poison clouds on the same tile will take damage from each.

Does the number in brackets indicate the amount of poison damage accrued per instance of ability effect, or the number of ability effects checked for in a single instace? (e.g. Hydra Hatchling has Poison Cloud (4) while Hydra has Poison Cloud (8). Does that mean each instance accrues 4/8 poison damage instead of 2, or does it mean it applies 4/8 instances of the regular Poison Cloud effect?

Determine chance/frequency of effect spawning on/around unit possessing this ability.