
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
The eccentricity of the ellipse $C$: $\dfrac{x^{2}}{a^{2}}+\dfrac{y^{2}}{b^{2}}=1(a > b > 0)$ is $\dfrac{\sqrt{3}}{2}$, and one of its vertices is on the directrix of the parabola $x^{2}=4y$.

(Ⅰ) Find the equation of the ellipse $C$;

(Ⅱ) Let $O$ be the origin, and $M, N$ be two different points on the ellipse, with the slopes of lines $OM$ and $ON$ being $k_{1}$ and $k_{2}$, respectively. When $k_{1}k_{2}=-\dfrac{1}{4}$, discuss whether the area of $\triangle MON$ is constant. If it is constant, find the value; if not, explain why.

Present the answer in LaTex format: \boxed{Your answer}
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