To increase attributes in The Elder Scrolls IV: Oblivion, you primarily level up your character by improving your major and minor skills. Each time you level up, you can allocate 12 attribute points among three different attributes, with a maximum of +5 points per attribute per level (except Luck, which costs 4 points per increase)

. Here are key methods and tips to increase attributes:

• Leveling Up : The main way to increase attributes is by leveling your character. Leveling progress is tied to skill increases; once enough skills have improved (usually 20-26 skill increases), you can level up and assign attribute points

• Choosing Attributes to Increase : You can increase three different attributes at each level-up, with a maximum of +5 points per attribute. Luck is more expensive to increase (4 points per +1)

• Starting Choices : Your race, gender, birthsign, and class affect your initial attribute values and bonuses. For example, birthsigns can grant +5 bonuses to two attributes, and the Oghma Infinium book can permanently boost two attributes by +10 each

• Vampirism : Becoming a vampire increases Speed, Strength, and Willpower by up to +20 at the final stage of vampirism, raising these attributes to a maximum of 120

• Recommended Attribute Priorities : Depending on your playstyle, different attributes are more important:
  • Melee builds benefit most from Strength and Endurance (for health and damage).
  • Archers should prioritize Agility and Speed.
  • Mages need Intelligence (to increase magicka) and Willpower (for magicka regeneration)

• Attribute Effects :
  • Strength increases fatigue, carry weight, and melee damage.
  • Endurance increases health gains at level-up.
  • Agility reduces chance of being staggered and increases fatigue.
  • Intelligence increases total magicka.
  • Willpower improves magicka regeneration and resistance.
  • Speed increases movement speed and jump length.
  • Personality affects NPC disposition.
  • Luck modifies skill effectiveness but is costly to increase

• Additional Notes : To complete leveling up after gaining enough experience, you must sleep for at least one hour

. Also, some quests and items (like the Scales of Pitiless Justice) can modify attributes temporarily or permanently

In summary, to increase your attributes in Oblivion, focus on leveling your character by improving skills, then allocate your attribute points wisely based on your build and playstyle. Use birthsigns, the Oghma Infinium, vampirism, and quests to gain additional attribute bonuses where possible