Alter Aeon Online Help

Keywords are:  'skill survivalist mountaineering'

Skill: mountaineering           Lvl 26  Any  (85%)
                                Requires: spelunking
                                Group: Orienteering
                                Guild: The Cartographers Guild  Rank: Expert

'mountaineering' is an automatic skill that works when in mountainous or
hilly areas.  A player with this skill may be able to go places that
others cannot, and will generally not be so exhausted from difficult
climbs. It also becomes less tiring to gather raw materials in highlands
when well-versed in the skill.

If you know mountaineering, you will be slightly more effective when hiding
in highland terrains.