Most of the keywords are highlighted in the NPC's text, but there are hidden keywords that the player must find themselves. In Lighthaven, there is a blacksmith, a weapon smith, a nearby wizard's tower where you can learn damaging spells, and the temple where you can learn healing spells as well as get healed directly. There is even a bank where you store your money and have it available in all towns. Other NPCs will teach you new skills or train you in your existing skills. Of course, NPCs can also give you quests.
Quests range from errands and retrievals to kill quotas and assassinations.
Some quests require thinking to complete, and others will open up new areas. There are dozens of minor quests which do not have any real bearing on overall story of T4C, but are good for boosting your character. Depending on which path you choose, the NPCs will start acting differently towards you. Most of the quests are very combat-oriented, as is The 4th Coming as a whole. In the immediate area of Lighthaven, there is a dungeon under the temple, a crypt in the graveyard, and a cavern in the mountains.