You can use this while in a mek and this make a dome

The M.D.S.M generates heat while active, and will also automatically deactivate once overheated.

While active, allies inside the dome will take 30% reduced damage. This buff is signaled by the presence of a aura of blue squares rising from them.

When enemies under the shield exit to the outside of the shield, they get 40% increased damage taken and 30% reduced movement speed for 30 seconds

Deactivating the shield does not inflict this debuff. This debuff is signaled by the presence of an aura of red squares rising from them.

What does this do (first tip) “a helpful tip should include a few words”