I was just flicking through the Relictor chapter information here:-
http://warhammer40k.wikia.com/wiki/Relictors
They sound very much like the sort of fellows that Malal would be sponsoring, especially with gear such as:-
Blade of Phaedron - Inside the Blade of Phaedron lies the seething soul of a daemon possessed of a great enmity for all its kin. Although this Daemon Weapon is unremarkable when employed against a living being, against another daemon the blade will blaze white with the pure heat of the captive daemon's rage.
Their seeming ability to wield daemonic weaponry without being corrupted would certainly indicate that another power is intervening to protect them, prayers and meditation or not. And since the Emperor doesn't generally bless those carting about warp gear, Malal (or Malice, or we're going to be accurate) would appear to be the prime candidate.