Using dragons with traps

[Ryastar]

The anti-dragon trap technique is actually less of a mage technique, because it largely depends on the onslaught skill. You need level one onslaught for sure to pull it off, and more levels really helps. If you cannot get the onslaught skill (which, as a mage, i usually make a priority for the use of my might runes because that extra init makes a big difference), then I would suggest trying to find items that boost your troops initiative.

As a side note, if you are level 20, you should be at least in ellinia, which means you DO have access to dragons, red and black are available in the land of the dead, and green in 1000 rivers. If you still have anga's ruby, you can use sprites or lake fairies, which combined with anga's ruby will have enough init to go before even black dragons (I am certain about lake fairies, but not 100% sure about the sprites going before blackies. Sprites are superior soldiers, though)