Help with modding -.-

[N3MES1S]

Hello fellas -.- im trying to make the phoenix as a usual unit, without the resurrect hability (as logical) and with some cool skills, like a storm of flaming arrows or something else. I just asking for people who knows something about modding on king's bounty. I am making the mod based on the army of light one, allowing royal griffins to convert on phoenix. The first problem is, that the model doesnt appear complete on the battlefield, just a part of the phoenix texture, like if something was missing (see image). Ay ideas? and any ideas about the special skills should be good (not too hard to make cuz i am not a modder, just trying to make something for making KB life longer).