Stylised tower assets with multiple evolutions for unity game

I require an ice/water themed slowing style tower, with 3 variants. basic, intermediate and fully upgraded

i am using this asset pack already

https://assetstore.unity.com/packages/3d/props/weapons/tower-defense-kit-megapack-320370

so the models and textures need to be of similar quality and design. no vfx is required only the models and textures