Looking for ideas for a treasure hunt race

[Alerad]

As per the title. The PCs will be hunting an artifact that another adventuring group is also after in a dungeon or tower within a frozen tundra. The enemies are three Evil Mage-s plus goons. What kind of race mechanics/obstacles could I use? The artifact in question is a frost giant/ess whose power they need to obtain.

[SirGraystone]

The first obstacle since its a frozen thundra should be the weather, DMG have rules for cold/exhaustion. Once at the tower, did the enemies get there first? Then they should have a rear guard waiting for the players, but you should also find dead goons from the tower's traps.

What is that tower exactly? Who made it giants? Then everything should be bigger, door need strength check to open, stair step should be higher making them difficult terrain. A giant's sized barrel going down the stair could be painful. If it break spreading alcohol all over the players have the bad guy throws a torch at them.