A frost giant leader is often a barbarian, cleric, fighter, or sorcerer, but some of the most evil and ruthless frost giants become blackguards.
The frost giant jarl described here has all the qualities and abilities of a typical frost giant, as well as other abilities (see the statistics block) from being a blackguard. Details on some of these abilities follow.
Aura of Despair (Su): This jarl radiates a malign aura that causes enemies within 10 feet of him to take a ?2 penalty on all saving throws.
Aura of Evil (Ex): This jarl radiates a strong aura of evil (see the detect evil spell) as an 8th-level cleric of an evil deity.
Command Undead (Su): This jarl can command and rebuke undead as a 6th-level cleric.
Dark Blessing (Su): This jarl applies his Charisma modifier as a bonus on all saving throws.
Detect Good (Sp): At will, this jarl can use detect good as a spell-like ability, duplicating the effect of the detect good spell.
Poison Use: Blackguards are skilled in the use of poison and never risk accidentally poisoning themselves when applying poison to a blade.
Smite Good (Su): Twice per day, this jarl may attempt to smite good with one normal melee attack. He adds his +4 Charisma modifier to his attack roll and deals 8 points of extra damage (1 per blackguard level) if the attack hits. If he accidentally smites a creature that is not good, the smite has no effect but it is still used up for that day.
Typical Blackguard Spells Prepared (3/1; save DC 11 + spell level): 1st?cause fear, doom, magic weapon; 2nd?bull?s strength.
Possessions: +2 frost greataxe, +2 full plate armor, cloak of charisma +2, ring of minor energy resistance (fire), 2 doses of bloodroot poison. (Benefits of these items are included in the statistics block.)
SEE WIKIPEDIA ENTRY:

• Jotun
  
• Jarl
  

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System Reference Document -> List of Creatures (SRD)