Barricades require nothing to be put up, but OSRS gold there are just 5 provided per team. They can't be piled in classes then 3. Defenders also have to be ready to defend against the other team's attackers, for they could be attacked as well. He is responsible for maintaining their players alive. 

While they don't need to keep everyone alive to win, it helps substantially: every time a person on your team dies, the enemy's heart stone increases 20 hitpoints. Although it can go over it's first hitpoints level of 250, it cannot surpass 500 hitpoints. To keep his teammates living he has to use healing spells.

Spells, impacts, and level requirements as follows: Mend- 65 magical required, heals 15 percent of player's hitpoints. Heal- 78 magical demanded, heals 20% of player's hitpoints and decreases all toxin damage dealt by 2 for each hit. Save85 magic required, heals 25 percent of player's hitpoints, reduces all irreparable harm, (toxin, Morgan's Javelin spec damage) by 4. Resurrect: 92 magical required, fixes half of those hitpoints dropped by the individual, cures all irreparable harm completely and prevents poisoning for following moment.

These charms may be used in two manners. The healer can use them directly on the individual they wish to heal. This works well, but is dangerous for the healer as it may mean straying from the base, (Healers can't be murdered while inside their foundation. Any attacks on these will only render zeros. With that said, should they venture outside their base to heal players, then they risk death just like any other participant ) .

Another alternative is to cast the spell through the center stone. Being blessed with tremendous power, the center stone can deliver the magical over the whole battle to its intended target. This method has a 15 second cool down to the center to regenerate its own power. In case the hearthstone has higher afterward 250 hitpoints the cool down time increasesup to buy old school runescape gold 30 seconds if the stone is at 500 hitpoints.