For Ice 1, if you get to either of the lower corners, Yendor will not agro. Make sure not to move from the corner until the enemies are 7 tiles away from Yendor. If you do this, it pulls 5 giants (4 + 1 from the other side).
Ice 2 is a little more complicated. The lowest row of the map won't agro Yendor, but it also won't agro any of the ice giants. There are a few options, a scroll of poison fog placed properly will agro a bunch of giants while letting you retreat back safely. The option without any resources only has a 50% chance to work: Move up from the lower wall into vision range of one giant, and hope you get the 50% chance it doesn't shout immediately on seeing you, then SP back to the wall.
Burst of wind is a very versatile spell, however I don't trust it as it is a little unreliable, not working properly with corners. Shroud of wind is amazing, one of the best passives that I always try and pick up with any class. Honestly, you don't need much more than Lightning Bolt 2 to clear the game, it wipes everything up until VoY with no issues. Pick up a few more talents as you like on the way there, and enjoy the win.