It can give experience for combat while you are fighting in the dungeons.
skill levels of 70+ and a combat level of 90+
any level you just have to have 99 of that skill.
Fight a lot.
You can the highest you can get any skill in Runescape is 99. And the highest combat level you can get is 138.
If you read the Runescape skills manual you wouldn't ave had to ask this question.
The skill was made that way. Maybe they needed 120 level fit all their ideas.
Advancing in the skills Attack, Defense, Strength, Prayer, Magic, Ranged, Constitution (formerly Hitpoints), and Summoning affects your combat level. It usually requires a number of level advances in these skills to advance one combat level. Please note that the Summoning skill is members only and combat levels gained from your level in this skill will not be shown when playing on free servers.
See related links, for a list, at Runescape Wikia.
The highest combat level that can be attained by free players is 126, while members can reach a maximum combat level of 138. On free servers, a player's combat level will not be higher than level 126, as combat levels due to the Summoning skill are omitted. The highest skill level you can level up to is 120, in the Dungeoneering skill. In all other RuneScape skills, the maximum level is level 99 (though this can be boosted temporarily through means such as potions). The highest total level currently attainable is 1614 for free to play players and 2496 for members.
Gertjaars has a combat level of 138 and has 99 in every skill on runescape.:) ya but he's not the coolest
138 for members, and 126 for f2p.138 for p2p as the new summoning skill adds one combat level for a certain amount of summoning levels gained.hence the availability to reach level 138 is only for p2p since summoning is a p2p skill.
By fighting, until you have enough skill points to get the desired combat level.