A_BetaSkullAttack
From ZDoom Wiki
A_BetaSkullAttack
The attack of press-release beta Doom's version of the lost soul. It is an invisible, instant attack that inflicts (1d8 times the calling actor's damage property) points of damage to the target, unless the target belongs to the same species as the calling actor. Since it inflicts damage directly, rather than through a projectile or a hitscan, it can never trigger infighting.