Eight Forms of Mahakala from Fifty Chapter Mahakala Tantra according to the root text and system of the Mahakala Tantraraja Nama [w25348] in the tradition of Abhayakara Gupta: 

1. Two-armed solitary with two retinue figures (right arm raised or placed at the heart)

2. Four-armed solitary with four retinue figures

3. Six-armed with consort

4. Eight-armed with consort

5. Ten-armed with consort 

6. Twelve-armed with consort

7. Fourteen-armed with consort 

8. Sixteen-armed with consort

There are eight forms of Mahakala described in the Fifty Chapter Mahakala Tantra (Mahakala Tantraraja Nama. nag po chen po mgon po mngon par 'byung ba zhes bya ba'i rgyud kyi rgyal po.