Santi Gzlez has had a great cast of musicians collaborating Spanish extreme metal scene:

Click on the name to learn more about each of them.

Guitar:
Achokarlos – Exquisite Pus; Symtoms of Lethargy; Acholarlos
Exo - Noctem
Gorka Laherran – Natural Born Stonehad; Psychofusion; Calocando
Iván Duran – Hybrid; Cachalotauro
JL Montans - Kathaarsys; Rara Vez
Oscar Comendador- Mind Holocaust; Evil Rise
Pol Luengo– Aggression
Ricardo Moreno – Vodevil Vargas; ex-Knell Odyseey; ex-Avulsed
Samuel Morales - Helevorn
Sandro Vizcaino- Helevorn
Vrolok D. – Demised; ex–Hole Of Mankind; ex–O Miserum Mane

Bass:
David Mendoza – Hardkuannon; Antropomorfia
Paco Espada – Johnny Blood; ex-O Miserum Mane

Voices:
Carlos Mejias– Thirst Of Revenge; Ex-Human Mincer
Kike Capilla – Rex Devs