Dota – At what levels do you unlock game modes

It's the most important to max out the fatal bonds. This spell is very important since it will deal damage to the hero even if he's not in range. You should not forget about the other damaging spells and you very powerful ultimate.

To babysit properly you should sit in front of the battling creeps so that your carry can farm with no worries and you harass the enemy hero. Take note that when you attack the enemy hero, you get aggro from his creeps. You can lose quickly aggro by attacking your own creeps using Ctrl + A + click on friendly creep. This will make you lose aggro (even from enemy towers!). This way you harass the enemy and make the enemy creeps lose momentum by switching targets very often.

Your carry (supposing you babysit a carry,, otherwise it's pretty pointless) should only last hit the enemy creeps because you don't want to push the lane too much so that you stay in the safe area.

Regarding items, you should put observer wards the near forest (if Radiant bottom or if Dire top) you should go for Arcane Boots and Mekansm or Pipe of insight. These are items that are quite cheap and they are of course sometimes situational, but usually they come in handy when playing a true support. A very important item for the warlock though is the Refresher Orb since it doubles your ultimate and Aghanim's Scepter that makes your ultimate spawn 2 infernal golems. You could also use Rod of Atos a very powerful item that is underused. It cripples the enemy hero slowing him a lot and it has a pretty huge range.

This was a bug that was affecting some players (including me). It has been fixed with minipatch on May 1st, 2013.

Patch notes:

UI
- Fixed an issue where matchmaking region selections were not being saved correctly. These selections have been reset and players will have to re-select their regions.