Small but Brawny is a passive skill in the Wildling skill tree which reduces your shaman's size by 4% for each skill point allocated.
The maximum allocated skill points is 5, which, when fully upgraded, decreases your shaman's size by a total of 20% when fully upgraded.
This skill will affect both shamans in maps with multiple shamans. A smaller shaman will be able to squeeze through some holes that normal-sized mice cannot.
If this skill is used without the Solitary skill in soulmate maps, the link between the shaman and soulmate will be broken at the start of the round. This effectively makes the Solitary skill redundant.
This skill works together with the Big Shaman skill.