Exhibit 4.16



Omnibus
Amendment to Subscription Agreements



This Omnibus Amendment to
Subscription Agreements (this “Amendment”), dated as of February 25, 2024 (the “Effective Date”), is by and among
Critical Metals Corp., a BVI business company incorporated in the British Virgin Islands (“PubCo”), VO Sponsor, LLC, a Delaware
limited liability company (the “Sponsor”), Sizzle Acquisition Corporation, a Delaware corporation (the “Company”)
and the subscriber party to the applicable Subscription Agreement (as defined below) set forth on the signature pages hereto (each, a
“Subscriber”). Each such person is referred to herein as a “Party” and, collectively, such Persons are referred
to herein as the “Parties.”



WHEREAS the Parties
have entered into those certain Subscription Agreements, dates as of February, 8, 2024 (each, a “Subscription Agreement” and,
collectively, the “Subscription Agreements”);



WHEREAS, the Parties
desire to amend each Subscription Agreement subject to the terms and conditions set forth herein; and



WHEREAS, pursuant to
Section 11(f) of the Subscription Agreements, such Subscription Agreement may not be amended, modified, waived or terminated except by
an instrument in writing, signed by the party against whom enforcement of such modification, waiver, or termination is sought.



NOW, THEREFORE, in
consideration of the foregoing and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged,
the Parties agree as follows:



1. Definitions.
Capitalized terms used in the Amendment but not otherwise defined herein shall have the meanings ascribed to such term in the Subscription
Agreement.



2. Amendments.
As of the Effective Date, each Subscription Agreement is hereby amended or modified as follows:



a. Section
9 of the Subscription Agreements shall be amended to delete the text “February 23, 2024” and substitute it with the text “February
27, 2024.”



b. Section
14(b) of the Subscription Agreements shall be amended to delete the text “the first anniversary of the Closing Date” and substitute
it with the text “15 months following the Closing Date.”



c. Clause
(x) in Section 15(c) of the Subscription Agreement shall be amended and restated in its entirety to replace the words “(x) the price
paid by Subscriber for such Acquired Share (which, for the avoidance of doubt, will not be higher than the redemption price offered by
the Company) . . . ” with the following words “(x) the price paid by Subscriber for such Acquired Share (which, for the avoidance
of doubt, will not be higher than the redemption price offered by the Company), plus any and all commissions and fees relating to the
purchase of such Acquired Share . . . ”.













d. The
number of Bonus PubCo Shares due each Subscriber pursuant to the terms of the Subscription Agreements, as referenced on the Subscriber
signature page of each Subscription Agreement, is hereby revised to increase the number of shares as follows:



(x) for Empery Asset Master, LTD, the
number of Bonus PubCo Shares is hereby increased from 571,345 to 628,479;



(y) for Empery Tax Efficient, LP, the
number of Bonus PubCo Shares is hereby increased from 175,386 to 192,923;



and



(z) for Empery Tax Efficient III, LP,
the number of Bonus PubCo Shares is hereby increased from 253,269 to 278,598.



e. Section
1 of the form of warrant, which is attached as Exhibit B to the Subscription Agreements, shall be amended to delete the text “the
first anniversary of the Closing Date” and substitute it with the text “15 months following the Closing Date” and a
corresponding change shall be reflected as the expiration date set forth on the cover page of the warrant.



3. Effect
of Amendment. Except as expressly provided in this Amendment, all of the terms and provisions of the Subscription Agreements are
and will remain in full force and effect and are hereby ratified and confirmed by the Parties.



4. Governing
Law. This Amendment is governed by and construed in accordance with the laws of the State of New York, without regard to the conflict
of laws provisions of such State.



5. Counterparts.
This Amendment may be executed in two or more counterparts (including facsimile or “pdf” counterparts), each of which shall
be deemed an original, but all of which together shall constitute one and the same instrument.



[Signature Page Follows]



[Signature Page to Omnibus Amendment to Subscription
Agreements]





2







IN WITNESS WHEREOF,
the Parties have executed this Amendment as of the date first above written.



| | PUBCO:               
| | ---------------------
| |                      
| | Critical Metals Corp.



| | By: | /s/ Tony Sage
| | --- | -------------
| |     | Name:        
| |     | Title:       



| | THE COMPANY:                  
| | ------------------------------
| |                               
| | Sizzle Acquisition Corporation



| | By: | /s/ Steve Salis
| | --- | ---------------
| |     | Name:          
| |     | Title:         



| | Sponsor:       
| | ---------------
| |                
| | VO SPONSOR, LLC



| | By: | /s/ Steve Salis
| | --- | ---------------
| |     | Name:          
| |     | Title:         



[Signature Page to Omnibus Amendment to Subscription
Agreements]





3







Subscriber
Party:



Empery
Asset Master, LTD



By: Empery Asset Management,
LP,

its authorized agent



|By:    | /s/ Brett Director                             | 
|------ | ---------------------------------------------- | 
|Name:  | Brett Director                                 | 
|Title: | General Counsel of Empery Asset Management, LP | 



Empery
Tax Efficient, LP



By: Empery Asset Management,
LP,

its authorized agent



|By:    | /s/ Brett Director                             | 
|------ | ---------------------------------------------- | 
|Name:  | Brett Director                                 | 
|Title: | General Counsel of Empery Asset Management, LP | 



Empery
Tax Efficient III, LP



By: Empery Asset Management,
LP,

its authorized agent



|By:    | /s/ Brett Director                             | 
|------ | ---------------------------------------------- | 
|Name:  | Brett Director                                 | 
|Title: | General Counsel of Empery Asset Management, LP | 



[Signature Page to Omnibus Amendment to Subscription
Agreements]





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