With 38 hp is kinda hard, you could make it tho. Honestly I suggest you to train a little on HP. Mage is cool I had a friend with 70 magic that finished DT easily, but had 70 hp. Btw what's your prayer lvl?
Get over 50 prayer and get a higher mage and defence level. Train your combat high as you can cause' your gonna need it, you will have a defeat alot of tough enemies.