Some species may receive different items based on their unique restrictions.
These are adjusted by your species' aptitudes.
Stalkers function like Assassin/Transmuter hybrids, using Fulsome Distillation to gather potions and Evaporate to disable enemies before moving in for the kill. Later, their Transmutations spells provide powerful melee combat capabilities, especially for species that excel in Unarmed Combat.
Stalkers were removed in 0.12.