Transparent shader with depth writes

By the way,

Here is what I have with a second pass using a surface shader and the code.

 Tags { "RenderType"="Transparent" "Queue"="Transparent" }
 LOD 300
 Cull Back
 
 CGPROGRA$$anonymous$$
 #pragma surface surf BlinnPhong vertex:vert alpha
 
 fixed4 _Color;
 fixed4 _ShieldColor;
 half _Scale;
 half _Offset;
 half _Shininess;
 sampler2D _Bump$$anonymous$$ap;
 sampler2D _$$anonymous$$ainTex;
 
 struct Input 
 {
     float2 uv_$$anonymous$$ainTex;
     float2 uv_Bump$$anonymous$$ap;
 };
 
 void vert(inout appdata_full v) 
 {
     v.vertex = mul(float4x4(
         _Scale, 0, 0, 0,
         0, _Scale, 0, 0,
         0, 0, _Scale, 0,
         0, 0, 0, 1 ), v.vertex);
 }
 
 void surf (Input IN, inout SurfaceOutput o) 
 {
     o.Albedo = _ShieldColor.rgb;
     o.Emission = _ShieldColor.rgb * _ShieldColor.a;
     o.Alpha = _ShieldColor.a;
 }    
 ENDCG

Here is what I have with a second pass using a frag shader.

 Pass 
 {
 Blend SrcAlpha One$$anonymous$$inusSrcAlpha
     
 CGPROGRA$$anonymous$$
 #pragma vertex vert
 #pragma fragment frag
 
 #include "UnityCG.cginc"
 
 struct v2f 
 {
     float4 vertex : SV_POSITION;
 };
 
 half _Scale;            
 fixed4 _ShieldColor;            
 sampler2D _$$anonymous$$ainTex;
 float4 _$$anonymous$$ainTex_ST;
 
 v2f vert (appdata_base v)
 {
     v2f o;
     float4x4 matrix = float4x4(
         _Scale, 0, 0, 0,
         0, _Scale, 0, 0,
         0, 0, _Scale, 0,
         0, 0, 0, 1 );
 
     o.vertex = mul(UNITY_$$anonymous$$ATRIX_$$anonymous$$VP, mul(matrix, v.vertex));
     return o;
 }
 
 fixed4 frag (v2f i) : SV_Target
 {
     return _ShieldColor;
 }
 ENDCG
 }