How about a turret unit? As in, you move it to where you want, select 'Deploy' and then you cannot move it but it has a ton of attack?
Another possible unit is a 'missile ship', which is an aquatic unit that can produce missiles and fire them at extreme range for obscene damage, but cannot fire if it runs out of missiles/suicide goats/laser crystals/whatever. Also cannot target air units (mayhap a little unfair on the Titans)
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